Cold Case Quartet Books in Order

For twenty-four years, William Wisting has revisited Katharina Haugen’s disappearance and her unexplained written code. When her husband also vanishes, a second missing woman draws the detective toward questions he can no longer treat as routine.

Millions in unexplained cash turn up in a dead politician's coastal cabin, drawing William Wisting toward a disappearance fifteen years earlier. To connect the cases, he must work with an adversary and confront dangers uncomfortably close to home.

A convicted serial killer escapes while leading police to a victim's grave, forcing William Wisting into an urgent manhunt. Another recent murder bears the same signature, raising the possibility that the fugitive has a dangerous accomplice.

Twenty years after a teenager's murder, William Wisting receives a letter suggesting her convicted boyfriend was innocent. Tracking its sender and unraveling its clues could expose the real killer before another life is lost to a concealed injustice.