A woman shared as a sister by Jason Vaughn, Darius Coltrane, and Sean McCoy, appears after a fifteen year absence from their lives. And the news Sylvia Rainier Pantera brings to the guys of TFCC; someone's painted a target on Jason's back...again. But Sylvia has a dark secret; she's the international assassin broker called the Panther. And suffers from a debilitating hear condition. Now as she survives a risky heart transplant, Jason and TFCC work to protect Sylvia, her husband, Richard Pantera and the couple's two children, Alistair and Sophie.
