Gower Street, 1883: March Middleton is the neice of London's greatest (and most curmudgeonly) personal detective, Sidney Grice. March has just discovered a wealthy long-lost relative she never knew she had. When this newest family member meets with a horrible death, March is in the frame for murder and only Sidney Grice can prove her innocence.
There is a hint of Armageddon in the air. According to the Nice and Accurate Prophecies of Agnes Nutter, Witch (recorded, thankfully, in 1655, before she blew up her entire village and all its inhabitants, who had gathered to watch her burn), the world will end on a Saturday. Next Saturday, in fact.