Reluctant Agent

Captain Malcolm Robertson of His Majesty's Air Service is angry.
He has been blackmailed into resigning his commission and joining the British Secret Service. His mission? Identify and obtain an artifact that is powerful enough to defeat a malevolent supernatural being intent on controlling the world. The mission takes him from the secret underground headquarters of the Secret Service to Vienna, the United States of America, and the South Pacific.
Can Malcolm overcome his anger and resentment to obtain the artifact and defeat the entity?