Haunted by recent hardship, Noah struggles to navigate the challenges of his old life while attempting to adapt to a new one. A new love interest isn't enough to overcome a sense of dread. Someone is watching him. Season premiere.

One year earlier: after a stern request from Noah leaves Helen devastated, various pressures cause Helen and Vik to reexamine their relationship. Alison returns to Montauk after a crisis only to have her worst fears realized.

Running from secrets she left behind in Paris, Juliette finds Noah an alluring prospect. But a terrifying event shatters all hope of an easy affair. Meanwhile, Noah must fight like never before to make sense of what just occurred.

Cole is put in an increasingly impossible situation by Alison's return to his life. Alison must contend with Luisa while attempting to reconnect with her daughter. Simultaneously, a dangerous passion threatens to wreck everything.

Alison is motivated to spend a memorable day with Noah on Block Island for an unusual reason. Noah is left wistful by their profound connection, until the problems from which he was escaping return with a shocking force.

An unexplained absence sends Helen on a journey of increasingly troublesome discoveries. Compelled to return to a place he's spent his life trying to escape, Noah attempts to repair his relationship with Martin.

Helen gives Noah the help he needs - but at what cost? At his absolute weakest, Noah's world has never seemed more hostile or bewildering. A vital moment of release turns suddenly into something that can't be undone.

An unexpected cause to celebrate provokes a sobering realization in Alison. Soon after, a startling warning leaves her pondering the unthinkable. Cole's frustrations with Alison come to a head, revealing a radical truth.

Noah's visit to Paris provides Juliette with a distraction from unpleasant realities at home. A chance encounter offers Noah the possibility of healing a relationship in desperate need of repair.