Season 2 follows Mia Coleman, a Montreal police officer. Mia is approaching her fortieth birthday and grieving the end of her relationship with her ex, and her ex's son, whom she embraced as her own. At work, the constant injustice she faces gnaws at her own sense of purpose. Mia''s already tumultuous life is turned upside-down when a seemingly routine intervention in a family crisis involving Paul and Keri Whitman results in the worst imaginable outcome. What if Mia and her partner Tyler had the evidence that would have prevented this life-altering event? Through Plan B, a strange agency that can take her back in time, Mia will stop at nothing to prevent a family tragedy, and will embark on a journey during which she'll delve deep into her own psyche, confronting buried emotions and an unresolved past. Could Mia's chosen path be a desperate but subconscious attempt to heal her own wounds? Season 2 of Plan B explores the mind of a woman who, in her efforts to change a family's destiny, discovers her own.

The day when Philip discovers the possibility of going back in time, he does not hesitate. Since Evelyn, the love of his life and companion for the past six years, has left him, his life has lost its meaning. With the tremendous power he wields thanks to Plan B, he attempts to save his relationship, his law firm and his dysfunctional family. But Philip soon realizes that even the smallest choice has repercussions - as uncontrollable as they are unexpected - on his life and the lives of others. And even though he can stop tragic events before they happen, Philip cannot erase the memories and the emotions associated with them. Nothing will ever be without consequence again.