The Body in the Marsh by Nick Louth

A woman goes missing - and for the detective, this time it's personal. Criminologist Martin Knight lives a gilded life. But then his wife Liz disappears. There is no good explanation and Martin goes on the run. To make things worse, Liz is the ex-girlfriend of DCI Craig Gillard who finds himself drawn into the investigation. Is this a missing-person case or something more sinister? How dark can the truth be?