An FBI agent trains and handles agents who go under cover to solve crimes; Joe mourns the loss of one of his own as the dangers of the job become all too real.

Joe and Lola use a dead body to weave a net for a known killer in order to find where he's buried the bodies; Darnell and Lily act as a couple on the rocks in order to create a diversion while the FBI plants a bug in a suspect's car.

Lily goes undercover as an Irish nanny in order to determine the whereabouts of another Irish nanny who has gone missing and is possibly dead. Joe tries to set Darnell up as a collector/enforcer for a high-powered bookie they want to bring down.