While a new rookie has joined 15 Division -- ex-soldier Nick Collins, who is trying to adapt to civilian policing after serving in Afghanistan -- the rest of the rookies are now entering their third year on the job. They have overcome the sophomore curse: that a little knowledge is a dangerous thing. However this year, the rookies of 15 Division are going to have to learn to be careful what they wish for - and they are going to learn it the hard way.
Spoilers ahead. Coverage follows the scope labeled below.
Complete story — includes the ending
After her three-month suspension, McNally faces an official hearing which will decide if she should be reinstated back onto the force. However, upon returning, she and Swarek are accidentally involved in a missing child case when a drunk driver ( William Shatner ) collides with a van and finds a teenage girl in the back. Also, Peck gets a shock when a new rookie, ex-soldier Nick Collins ( Peter Mooney ), arrives for his first day at 15 Division. This episode marks the debut appearance of Peter Mooney as Officer Nick Collins.