The new novel in the atmospheric Gower Street Detective series introduces a chilling locked room mystery to Detective Sidney Grice and his precocious ward March Middleton.

So, when a beautiful young woman turns up at the door, imploring London's foremost private detective to solve the mystery of her father's murder, Grice can barely disguise his glee.

Mr. Nathan Garstang was found slaughtered in his bed, but there is no trace of a weapon or intruder. A classic locked-room case. But what piques Grice's interest is the crime's link to one of London's most notorious unsolved murders. Ten years ago, Nathan's uncle aunt and servants were murdered in their sleep in the very same house.

Now, it seems, the Garstang murderer is back...