June 1946. London, England.
A murdered man. A mysterious woman. A cryptic note.
Irene Holmes-daughter of the long-retired Sherlock Holmes-spent the war years assisting her childhood friend, Detective Eddy Lestrade, using her sharp eye and sharper mind to uncover what others miss. Now, in a city still shadowed by war, her skills are more valuable than ever.
While searching for a new place to live, Irene meets Joe-a man who finds her instantly intriguing and has more than enough opinions to match her own.
When a baffling murder lands on Eddy's desk, Irene is drawn into a case: A message left in a mysterious red substance, and clues lingering from the war point in too many directions-and to far too many suspects.
Drawn in despite himself, Joe becomes an unlikely partner as Irene follows the trail through the uneasy streets of post-war London. Together, they must untangle a web of secrets before the killer strikes again.