After an operative kills all but one of the employees at a marine biology research group, McCall and the team join forces with Colton Fisk when they discover a connection between the murders and a secret CIA program he was involved in.

Aunt Vi enlists the help of McCall and the team when she realizes her masseuse is a victim of domestic abuse. Also, McCall trains Dee on situational awareness and Dante goes against orders by chasing after the man who shot his friend Manny.