When forensic archaeologist Ruth Galloway visits a museum to supervise the opening of a coffin containing a medieval bishop's bones, she finds the curator lying dead on the floor. Soon after, the museum's wealthy owner is also found dead, in his stables.

DCI Harry Nelson is called in to investigate, thrusting him into Ruth's path once more. When threatening letters come to light, events take an even more sinister turn. But as Ruth's friends become involved, where will her loyalties lie? As her convictions are tested, Ruth and Nelson must discover how Aboriginal skulls, drug smuggling, and the mystery of the "Dreaming" hold the answers to these deaths, as well as the keys to their own survival.