Cthulhu Britannica London 4: The Curse of Nineveh

In ancient times, when Nineveh fell, so too was a terrible evil banished. This evil, a god named Nabu with ambitions to rule humanity, was bound by the Children of Tranquillity into his former temple and buried beneath the sands. Two and a half thousand years later a group of archaeologists uncovered the Temple of Nabu and unleashed a terrible curse — the Curse of Nineveh!
The Curse of Nineveh is a seven-part campaign set in London in 1925-26. It concerns the events surrounding the return of the expedition from Nineveh and the consequences of what they brought back from there. Each adventure is based around one of the artefacts found in the Temple of Nabu. The climax of the campaign sees the artefacts’ true purpose revealed: to summon Nabu, an aspect of Yog-Sothoth, to possess King George V and manifest fully in London.
While you only need a copy of the Call of Cthulhu rulebook to play The Curse of Nineveh, you will also find a number of other books handy as well. The Cthulhu Britannica: London box set contains invaluable background information on London in the 1920s, as well as plenty of advice for Keepers about running games set there. In addition, The Journal of Reginald Campbell Thompson and The Journal of Neve Selcibuc are two novellas that shed light on events preceding the start of the campaign, designed as in-game artefacts that might be found by investigators and read by players in the course of your game.