Will Trent Season 4 Episode 17: Where'd You Come From, Little Angel?

A flashback to 2005: young Will, still robbing for a living, is brought before Captain Amanda Wagner after his arrest. Present day: Trent stands at the murder scene of research biologist Ethan Attis and his girlfriend Krista Sanderton, unable to focus — all he sees is Amanda's body on the street. Faith admits she is struggling too.

The background: Ethan worked for a biotech startup called BeneFuturum — the company hopes to find immortality — and left after falling out with CEO Ward Falcon. Krista's real identity is a scam, and her friend says she was always working an angle: she was working for Falcon. Falcon claims Ethan's research was useless and expensive; Falcon's assistant believes Ethan was onto something and turned down a lucrative offer at a recent conference.

Will steps back from the housekeeper interview, leaves his phone, and goes to the morgue to check something — where someone attacks him from behind and he wakes in his subconscious: an empty station, a man in a hazmat suit warning of a neurotoxin, and the day of his 2005 arrest, where he meets young Faith and young Amanda questioning why he was throwing his life away. In real life Angie finds Ethan's body missing from the morgue — Pete just returned from court to find it gone.

In the subconscious, Will figures it out: his attacker is Ethan. Ethan killed Krista for trying to steal his formula, then faked his death by taking the toxin — Ethan was studying worms, sharks, and other organisms that secrete tetrodotoxin, a toxin that slows the heart; he was using it to extend life by slowing the heart. Running out of oxygen, Will is visited by Amanda, who reminds him he is still the Trent she knew and can do the job. He thanks her for believing in him.

Ethan shows up; the hazmat man intervenes; goodbyes are said before time runs out, and Will is pulled from the freezer by his friends. At the hospital he tells them his theory, and Ormewood and Angie arrest Ethan just before he reaches his hidden toxin formula. Seth encourages him not to give up even after the year he's had.

The case closes with Ethan's arrest — the faked death, the toxin-slowed heart, and the formula hidden from his own attackers — while the hour's real ending is Will's goodbye. Amanda's ghost walks him back to life: she reminds him he is still the Trent she knew, he thanks her for believing in him, and the two say their goodbyes as the oxygen runs out. The 2005 flashback completes the circle — the arrest that started their partnership bookends her death.