After the shooting of Cyrus One by Billie, and Cyrus' gun missing she is arrested for murder and sent to jail, so Van and Deaq must find a way to prove her innocence, but after they discover that the only eye witness to the shooting, Skyler Chase, is a an undercover FBI agent, they suspect she may be a rogue agent and aim to prove her guilt and get Billie out of jail.—firefly_andy