This is the first book in the "Sherlock's War" collection; its sequel is titled The Devil's Blaze (published in Spanish as La llama del diablo ).

You can find more details or a copy of the book through major retailers like Casa del Libro or Amazon.

Sherlock Holmes in WWII Series by Robert J. Harris - Goodreads

London, 1942. While German bombs fall on the capital, a new terror haunts the streets. A serial killer dubbed "Crimson Jack" is meticulously reenacting the gruesome 1888 murders of Jack the Ripper. With police resources stretched thin by the war effort, Scotland Yard turns to the world's most famous detective: Sherlock Holmes. Alongside his faithful companion Dr. Watson, Holmes must navigate a city under siege to unmask the imitator before the bloody cycle is completed. Why Read It?

Reimagines Holmes and Watson in their fifties, serving their country during the Blitz.

Robert J. Harris Translation: Ana Isabel Sánchez Díez