A trail of suspicious deaths and a culprit who can’t be caught.Journalist Penny Green is reporting on what seems to be a straightforward poisoning case in Bermondsey. But then a series of macabre photographs comes to light. Memento mori with a twist.When Scotland Yard begins exhumations, Penny and Inspector James Blakely are daunted by the size of the investigation. The case is brought to a simple conclusion when the poisoner confesses. Or so everyone thinks.As the body count rises, the search extends across London to the warren of caves beneath Chislehurst. Few can match the cunning of a serial poisoner. Not only is Penny outwitted, she could also lose her livelihood.