Thirteen months ago, the old man was thought to have died of natural causes. But when the body is exhumed clear traces of poison are discovered.
Over the last six weeks of his life Edmund Craven was systematically administered small doses of arsenic. Meaning one of his nearest and dearest is responsible for his cold-blooded murder.
Superintendent Lambert has never had to investigate a murder thirteen months after it was committed. And it’s a career first he could have done without. With all tracks now well covered, he'll have to take several perilous risks to identify the killer.