Alone Against The Dark: Call of Cthulhu 7th Edition - Rules of Play says:

A solo play Call of Cthulhu mini campaign. No Keeper is needed as you guide yourself through the adventure. Alone Against The Dark is an adventure for one player, set in the fall of 1931. Your goal is to solve strange disappearances and to forestall a calamity about to beset the world. You will journey from New York City to Greece, Egypt, Germany, and Antarctica.