The Sword of Damocles by Anna Katharine Green [Detective Gryce Mysteries #4]

THE SWORD OF DAMOCLES is the fourth mystery in Anna Katharine Green's series of mysteries featuring her main protagonist, Detective Ebenezer Gryce of the New York Metropolitan Police. Gryce solves series of baffling Victorian-era crimes with the occasional help from spinster-turned-crimefighter Amelia Butterworth.