A team of hotshot FBI agents work to find out if one of their own has become a vigilante killer . . .
Supervisory Special Agent Wyatt Blackstone is famed for his cool control and his intellect. But his world was shattered when Lily, a vulnerable young agent on his team was brutally murdered.
Now, a killer is committing horrible crimes, leaving a lily as a calling card, and he and the rest of the Black CATs have to revisit a crime that haunts them all!