When her teenage daughter Lucy takes her own life, television host Abigail Walker is given the opportunity to reboot the past, courtesy of mysterious agency Plan B.

Desperately hoping to change the events that led to Lucy taking her own life, Abigail discovers that the underlying reasons are far more complicated than a quick fix will allow.

Abigail attempts to thwart fate by going further back into the past; an idyllic family trip to Ottawa is derailed when Lucy goes missing.