It's June in Montreal, and Dr. Temperance Brennan, who has left a shaky marriage back home in North Carolina to take on the challenging assignment of Director of Forensic Anthropology for the province of Quebec, looks forward to a relaxing weekend in beautiful Quebec City. First, though, she must stop at a newly uncovered burial site in the heart of the city. The remains are probably old and only of archeological interest, but Tempe must make sure they're not a case for the police. One look at the decomposed and decapitated corpse, stored neatly in plastic bags, tells her she'll spend the weekend in the crime lab.

It is a boiling summer in Boston. Adding to the city's woes is a series of shocking crimes that end in abduction and death. The pattern suggests one man: "The Surgeon," serial killer Warren Hoyt, known for his partial dissection of his victims, and recently thrown behind bars. Police can only assume an acolyte is at large, a maniac basing his attacks on the twisted medical techniques of the madman he so admires.

When she's not digging up bones or other ancient objects, Ruth Galloway lectures at the University of North Norfolk. She lives happily alone in a remote place called Saltmarsh overlooking the North Sea and, for company; she has her cats Flint and Sparky, and Radio 4. When a child's bones are found in the marshes near an ancient site that Ruth worked on ten years earlier, Ruth is asked to date them.

When a woman's body is discovered in a cathedral and hours later a young man is found hanging from a tree outside his home, Detective Lottie Parker is called in to lead the investigation. Both bodies have the same distinctive tattoo clumsily inscribed on their legs. It's clear the pair are connected, but how? The trail leads Lottie to St Angela's, a former children's home, with a dark connection to her own family history. Suddenly the case just got personal.

Composed of over 60 per cent water itself, a human body isn't naturally buoyant. It will float only for as long as there is air in its lungs before gradually sinking to the bottom as the air seeps out. If the water is very cold or deep, it will remain there, undergoing a slow, dark dissolution that can take years. But if the water is warm enough for bacteria to feed and multiply, then it will continue to decompose. Gases will build up in the intestines, increasing the body's buoyancy until it floats again. And the dead will literally rise....