Ryder Creed's top priority is to keep his scent dogs safe. In the dark there are threats that are impossible to see or predict. Ever since his Marine K9 unit searched for IEDs in Afghanistan, he's avoided nighttime searches. But when a boy goes missing in a remote area of the Florida Panhandle, Creed has to put aside his fears and navigate the risks his dogs will face after dark.GONE MISSING IN THE FLORIDA PANHANDLEWhile searching for a missing teenager, Ryder Creed and his scent dog, Bolo, stumble upon a homeless camp deep in the woods of Santa Rosa County. The boy was spotted in this area. But even after Bolo finds the teen's jacket, the homeless men swear they haven't seen him, leaving Creed and Sheriff Norwich at a dead end.A KILLER IN WASHINGTON, D.C.In the middle of the night, FBI Agent Maggie O'Dell is called to a crime scene in D.C. A man was bludgeoned to death while sleeping on the sidewalk. The M.O. matches another murder from the week before in the same area. Maggie and her team at Quantico believe this killer has struck in other cities and is targeting homeless men. After another brutal attack that leaves a colleague of Maggie's hanging on for life, Maggie grabs the only tip they have. She's determined to track this killer herself as he flees D.C. and leads her hundreds of miles to a place she never expected.ON A COLLISION COURSEWhen another boy disappears, Santa Rosa County Sheriff Norwich enlists Ryder's help, again. This time it's personal. The young boy is someone Ryder and his crew know. He's already been missing for eight hours and the search will lead them deep into the forest and after dark.The paths of Ryder's missing boy and Maggie's killer are about to collide.