Frantic about the kids, a concussed Martin leaves the hospital with Trevor. He finds Jake's note in his pocket: 318, the beginning (and end) of the Amelia Sequence.
On the dock by a freighter named Leviathan, Aster Corps chief counsel Larry tells Nicole Farington the $40-billion loss will be revealed tomorrow, and it's the beginning of the end. She says their fortunes will be reversed once the sequence is complete.
Tanner the hired thug delivers Jake and Amelia to Farington. Larry's not joining them on the ship, and she gives him a black backpack to hold onto.
Calvin visits his brother, whose health is declining, and promises he's close to a solution. He joins Farington and Dr. Linus on the Leviathan, where he's pressured to continue his work, to keep his brother safe.
Martin and Trevor find a glove in Martin's wrecked car and take it to Detective Lange. A fingerprint lifted from inside is tied to five different aliases - but one has a street address of 318.
Meanwhile, Avram meets the rabbi in charge, who berates him for meddling with the destiny of the Righteous 36 instead of just observing and reporting. Avram argues that the Covenant of the 36 was meant to grow and change, as humankind has changed, but the rabbi shuts him down. He shows Avram the completed sequence, written in a book chronicling the 36. Now humanity will either move forward, or it's the end of everything. Either way, Avram won't be involved, because the rabbi makes him sit in a chair until he learns his place.
The 318 address belongs to Tanner, who arrives unexpectedly but is overpowered by Martin - who beats the guy bloody. When Trevor pulls him off, they notice Tanner's wearing a wire. It's an insurance policy, proof of his conversations with Farington. In fact, he has a treasure trove of recordings, including one with Farington ordering Tanner to get rid of Lucy. Tanner tells them where the kids are, and Martin calls Lange.
Posing as an EPA inspector, Martin boards the ship and shuts down the engines.
Despite the danger of inducing coma in the kids, Linus starts the process. Soon Amelia is in distress, and she meets Jake by the pond in her mind. She tells the distraught boy she can't stay with him anymore and vanishes. The sequence completes, but the real Amelia is flatlining.
Martin finds the kids and attacks Linus. Calvin saves Amelia. Martin calls to Farington to turn on the news, and she sees a story about her ordering Lucy killed. The FBI swarms into Larry's office, and Lange's troopers board the ship while others arrest Tanner.
Calvin goes to William's care facility, but his brother has died. When Lange comes to arrest him, Calvin sadly says he never meant to hurt anybody. He just wanted his brother back.
Amelia's OK, but she can't see the probabilities anymore. Martin says she can stay with them until he finds her dad.
Later, Avram visits Martin and explains he can't be involved anymore; it's not his place. He gives Martin the Tree of Life amulet, saying it wound up with Jake for a reason, just like the cipher. It's meant to be carried by the protector of the 36. Martin says Jake isn't even 12 yet. Yes, that's why Martin should keep the amulet for now.
The FBI takes possession of the black backpack, which contains the cipher. It gets shelved in a government evidence warehouse . . . and the wheels start turning.