OTTILIE DIVINE'S WAR : The Diplomat Who Vanished (The Ottilie Divine Mysteries)

July 1939. As war looms, Ottilie Divine rents rooms in 221B Baker Street. When a diplomat disappears, she plunges into London’s clandestine underworld. Ciphered notes, enemy spies, and escalating peril force Ottilie to join a brilliant young Sherlock Holmes and Dr Watson in a race to expose betrayal.