A hanged man, a stolen painting, an impossible crime A marine engineer is found hanged in a locked apartment. Some artwork is stolen, then mysteriously returned. A security guard is found dead at the base of a Welsh cliff.When Fiona Griffiths is tasked to look through a stackload of cold cases, her bosses don't expect her to find anything of interest. But then she finds that an impossible robbery really happened. That a nailed-on suicide was anything...