When Ryder Creed responds to a devastating mudslide in North Carolina, he knows that the difference between finding survivors and the dead is time. He and his sturdiest search-and-rescue dog, Bolo, get to work immediately, but the scene is rife with danger: continued rainfall prevents the rescue teams from stabilizing the land; toxic household substances spread by the crushing slide fill the area with hazardous waste; and the detritus and debris are treacherous for both man and dog to navigate. But most perilous are the secrets hidden under the mud and sludge--secrets someone would kill to protect. For this is no ordinary rescue mission. Among the buildings consumed by the landslide was a top-secret government research facility, and Creed has been hired to find what's left of it.

Then rescuers recover the body of a scientist from the facility who was obviously dead before the landslide--killed by a gunshot to the head. The FBI sends Agent Maggie O'Dell to investigate, and she and Creed are soon caught in a web of lies, secrets, and murder that may involve not only the government facility, but decades-old medical experiments that are the subject of current congressional hearings. As more bodies are found under even more unusual circumstances, they come ever closer to exposing the truth--but with unknown forces working against them, Maggie, Creed, and the dogs are running out of time.