Stephen tampers with evidence in a murder case, with dire consequences. Dan and Zoe investigate the revenge killing of a predator. Zoe receives an unexpected proposal.

Claire is targeted by the serial killer while investigating the death of a jogger. Dan is rocked by news of Zoe's engagement to Kristof. Amber confronts her fears with help from an unexpected friend.

Zoe and Dan investigate two brothers for the murder of their parents. Stephen joins a new strike force hunting for the serial killer.