Alastair Bayardo

Nell's sister Sydney needs help when she gets mixed up in a Russian plot to steal classified intelligence from the Department of Defence.

Mace's dangerous secret is uncovered by Coulson and Mack, placing the agency under great threat as the splintered team tries to reunite.

Detective Lovato's past as an undercover officer tangles up with her present duty when one of the gang members she ingratiated herself with and developed feelings for turns up tortured and killed.