Castle and Beckett find themselves on opposite sides of the case when Castle’s old school friend emerges as the prime suspect in his own wife’s murder. As they work to…

Kate discovers that someone knows the secret of Aaron’s true parental lineage. Meanwhile, the dramatic shifts through time are placing the lives of the remaining island survivors in extreme peril.

The remaining island survivors start to feel the effects of the aftermath of moving the island, and Jack and Ben begin their quest to reunite the Oceanic 6 in order…