Edgar Wallace 
The Black Abbot [EPUB ebook] 

In the shadowy ruins of a medieval abbey, an age-old legend speaks of a ghostly monk known as the Black Abbot. When a series of strange events unfold and a treasure is rumored to be hidden in the abbey, intrigue and danger follow. Richard Marsh, a young lawyer, finds himself entangled in the mystery. As he delves deeper into the history of the abbey, he uncovers secrets that someone will kill to protect.

Set against a backdrop of ancient halls and secret passages, The Black Abbot weaves a gripping tale of suspense and adventure, perfect for fans of classic mysteries.