When a large-scale explosion rocks a Brooklyn apartment complex, the team quickly locates the perpetrator and discovers he's acting on the orders of a convicted felon currently serving time. Meanwhile, Isobel must name her successor before she moves into her new role.

As the holidays approach, the team finds three slain sex workers inside a brownstone - they uncover the murderer has a larger plan in place that they must rush to stop. Meanwhile, Jubal receives a concerning call from his son Tyler.