The Crimson Cryptogram — Fergus Hume

Dr Ellis is enjoying a quiet evening with his journalist friend Cass, when their mysterious neighbour, Mrs Moxton, bursts in upon them with startling news -- her husband has been murdered! Rushing to the scene, the two men discover Mr Moxton, stabbed in the back, the only clue to his assailant a mysterious series of markings, scrawled in blood on the dead man's sleeve...

Originally published in 1900, this is another exciting murder mystery from the pen of Fergus Hume -- master of the Victorian whodunnit!