Sweets spends the night in watching the television show, "Paranormal Abnormalities." The host, Palmer Heston, looks in a quarry for apparitions. Palmer notices a green glowing light and runs towards it. A bejeweled body lies on the ground-Sweets cannot believe his eyes.
The next morning at the diner, Angela and Brennan have breakfast. Brennan talks about her work but Angela is less than enthused about hers. She doesn't feel like an artist anymore. Brennan gets a call that the remains are at the lab, Angela tells Brennan she's going to stay and finish her meal. Brennan tells Angela that her fatigue from work and Michael Vincent can change her mood.
Booth joins Brennan on the Lab Platform, Brennan determines the victim is female and that time of death was six days ago. Hodgins tells them that the jewels are a mix of calcite, mica flakes, and prehnite which formed from the quarry's water run off. Once the heat came and evaporated the water, the crystals stuck to the bones. Cam takes off the victim's shoes-there are remodeled fractures on both feet and evidence of trigonum syndrome. Also, Cam notices the victim's shorts are at her ankles suggesting a sexual assault. Wendell takes it upon himself to try and remove the crystals from the bones, but instead snaps the victim's hand off. Brennan is horrified.
Angela and Brennan analyze the victim's foot x-rays in Brennan's office. Brennan notes that the injuries the victim suffered were common in gymnasts and dancers. Angela looks in the missing persons database to see if anyone was missing in those professions. Katarina Wirz was reported missing a week ago by her dance partner. Brennan tries to help Angela feel better about her job but isn't able to help.
Sweets talks to Katarina's dancing partner, Kendrick Mantorov. He tells Sweets that nothing would have stopped Katarina from dancing-she even moved from Germany to dance with him. Sweets is surprised to hear that Kendrick already has a new partner, Blossom. Kendrick says that he has auditions this week and Katarina wouldn't have wanted him to miss an opportunity.
Booth and Sweets have lunch at the diner and discuss the case. Sweets tells him that Kendrick and Katarina were "Special K" and they were going to audition for the show "Dance to the Top." Sweets explains that they were only dance partners. Booth admits that he put himself through college teaching dance classes. Sweets thinks Booth was a gigolo or stripper, but Booth tells him that his mom taught him how to dance. Booth tries to get back on topic-the stakes were high for Special K. Their theory is that maybe Kendrick tried to make a move and Katarina rejected him.
Wendell comes into the Ookey Room to see Hodgins conducting another one of his crazy experiments. Hodgins has put hundreds of maggots on a human body model covered in spam with shorts on. The maggots have pushed the shorts almost 7 centimeters in four hours. Wendell realizes that the victim wasn't assaulted and goes to tell Booth.
That night in Booth and Brennan's kitchen, Sweets suggest the couple go undercover. Brennan is excited since she believes she is a great dancer because she watches it on tv. Booth is hesitant to go undercover and thinks that he doesn't need to go undercover. Sweets explains that the killer is either going to come after Kendrick like they did for Katarina to knock him out of the competition or the killer is Kendrick. Booth agrees. Brennan is excited.
Booth and Brennan check in for auditions as Buck and Wanda Moosejaw.
Back at the lab, Wendell is still having trouble remove the jewels from the bones. Wendell begs for Hodgins to help him before he gets fired from Brennan.
Booth and Brennan scope out their dance competition. Brennan believes she is a great dancer but her moves say otherwise. Suddenly one of the dancer's mother, Maureen Serrano, yells at the delivery boy, Tommy. He brought her daughter, Laila, the wrong smoothie. Laila tries to calm her mother down and shoos Tommy away. Brennan notes that Laila is big competition now for Kendrick and his new partner.
Cam checks in on a frustrated Angela. Angela shows Cam the x-rays: even though they are beautiful the ones she has reconstructed aren't showing any injuries. Cam understands Angela's frustration and tells her that she can take some time off later but right now she needs to help solve the case. Angela understands.
Booth tries to talk to the other contestants but they aren't talking. Back in the lab, Hodgins and Wendell conduct an experiment to try and get the jewels off the bones. Hodgins believes that if the bones are put in amnonia and detergent solution that vibrations will allow the crystals to fall off. They attempt Hodgins' theory on a dummy body, unfortunately, the experiment does not go well and the detergent goes everywhere and the bones fall apart.
Brennan approaches Laila Serrano. Laila tells Brennan that her mother is a frustrated dancer and that she doesn't mean any harm. Her mother, Maureen, yells at Brennan to stay away. Brennan compliments the dress Maureen made for Laila. Brennan mentions Katarina and her death, Laila tells Brennan that they were friends and trained together. Maureen says that Katarina only wanted to tells her routines. Laila runs off upset, Maureen goes after her. Booth and Brennan attempt to dance while Brennan tells Booth what she found out.
Back at the lab, Hodgins re-attempts his experiment with the real body. Cam and Wendell watch skeptically but the experiment works and they can now proceed with their investigation.
Wendell checks in with Brennan when she returns to the lab. He shows her pictures of the victim's teeth which are eroded. Brennan thinks it could be from an eating disorder. Wendell believes he has cause of death: there are fractures and displacement on the victim's vertebrae meaning her neck was twisted until it broke.
Back at the Rehearsal Hall, Booth talks to Kendrick. Booth asks his advice on how to make Brennan a better dancer. Kendrick suggests that Booth gets a new partner and breaks off whatever personal stuff he has going on with Brennan. Booth asks if that's what Kendrick did with his old partner. Kendrick's not talking.
Cam notices Angela sneaking out of the office. Angela tells her that she is done for the day and that she wants to take her son to the museum to look at paintings. Angela leaves. Wendell comes rushing over to Cam. He has results confirming that the victim was poisoned with lead.
Hodgins confirms that Katarina was ingesting small amounts of lead over a long period of time but it wasn't lethal. Lead acetate is hard to taste. Cam realizes that lead acetate is used in men's hair dye and can be used to dye fabric.
Brennan and Booth video conference with Sweets in the FBI. Sweets tells the couple about the lead acetate and that the person poisoning her was probably incompetent when they realized that the lead wasn't going to do the job.
Angela, Cam, and Michael Vincent hang out in Angela's office. Cam called them back to the lab. Angela is annoyed that her museum trip was cut short. Angela pulls up the victim's email showing that she had a doctor's appointment with a neurologist the day after she died.
Booth and Brennan practice their moves. Brennan realizes that Laila's mom, Maureen, hand dyes all of her daughter's costumes.
Hodgins comes in to Angela's office to see his wife and son. Angela expresses her job frustrations to Hodgins. Hodgins comforts her. Hodgins goes to see Cam about Angela.
Brennan cuts a piece of Laila's costume to test for lead acetate. It's comes back positive.
Laila and her dance partner audition in the auditorium for the judges. She looks beautiful. The judges love her. Brennan congratulates Laila on her performance. Booth shows them his badge and pulls Laila and her mother aside.
Laila admits to poisoning Katarina with her mother's lead salts. She wanted Katarina sick so she could make it on the show and make her mother proud. Laila is upset to leave her life and her boyfriend, Tommy, to go to jail. Brennan tells her the poisoning didn't kill her. Maureen denies snapping Katarina's neck. Booth pushes the mother and daughter into a nearby locker and cuffs them in.
Booth realizes that the murderer is the boyfriend. He wanted Katarina dead so that his girlfriend could win the competition and get away from her mother. Booth and Brennan go back to the auditorium to find Tommy.
Kendrick and his new partner dance for the judges. Booth and Brennan scan the audience and find Tommy. They make eye contact with him. Tommy gets up and runs, Booth and Brennan chase him down while Kendrick continues to dance. Finally, Booth punches him out.
Laila and Tommy walk out of the dance competition in cuffs. Brennan is sad she didn't get to audition. Brennan wants to audition and have everyone from the Jeffersonian see her dance.
The team leaves the Jeffersonian to head to the audition. Cam tells Angela that she is going to have to cut back her hours, Angela realizes that Hodgins said something to her. Cam tells Angela is a win situation, Angela is grateful.
Booth and Brennan take the stage to waltz. They attempt to dance beautifully together but it doesn't go as well as they thought but the couple has fun anyway.