Two dozen Navy SEALs descended on Osama bin Laden’s compound in May 2011. After the mission, only one name was made public: Cairo, a Belgian Malinois and military working dog. This is Cairo's story, and that of his handler, Will Chesney, a SEAL Team Operator whose life would be irrevocably tied to Cairo's.

Across the Pacific Northwest, a twisted killer stalks victims representing ancient archetypes: The Ruler. The Warrior. The Scholar. The Priest. Four are dead, leaving FBI investigators puzzled by the macabre, color-coded shrines the killer left behind. And clues now point to a fifth victim.

Eden Mercer, a determined young officer in the fog-shrouded, tight-knit town of Nightfall, Oregon, is haunted by her past in a fundamentalist cult. With her loyal K-9 partner, Shadow, by her side, she’s eager to prove herself in a department dominated by machismo. When a couple stumbles upon a woman’s body in a ritualistic burial deep within the dense, misty forests, Eden is thrust into a chilling mystery. As she delves deeper, disturbing clues and unsettling secrets tied to a local cult emerge.

Meg and Hawk are part of the FBI's elite K-9 unit. Hawk can sniff out bodies anywhere - living or dead - whether it's tracking a criminal or finding a missing person. When a bomb rips apart a government building on the National Mall in Washington, D.C., it takes all of the team's extensive search-and-rescue training to locate and save the workers and visitors buried beneath the rubble.

First came the boom - the loud, deep, unapologetic bellow that seemed to erupt from the very core of the Earth. Eerily, the majestic high-rise slowly leaned to the south. On the 78th floor of the World Trade Center's north tower, no alarms sounded, and no one had information about what had happened at 8:46 a.m. on September 11, 2001. Blind since birth, Michael couldn't see a thing, but he could hear the sounds of shattering glass, falling debris, and terrified people flooding around him and his guide dog, Roselle.