Shadow Unit may have overturned the illegal arms cartel in Kuala Lumpur, but the harrowing undercover op left emotional scars on Sergeants Shawn Weller and Connor Finley. Slowly, patiently, they piece their partnership back together, closer now than ever before. But the arrival of Julian Montgomery, Shawn’s former CIA handler and lover, threatens to tear them apart. Julian knows all of Shawn's secrets as well as the past Shawn has kept hidden from Connor. Now the self-serving Julian wants Shawn back—with the CIA and with him. No one will get in his way. Including Connor. When the joint Shadow Unit/CIA mission to stop the supplier of a deadly biological weapon goes sideways, Connor is captured, tortured, and used as a human test subject. It’s a race against time to save his life. But who can Shawn trust? And who has gone rogue?