"Gail 2" is an original german scenario for the Cthulhu RPG published by Fantastische Spiele GbR and is the follow-up of "Gail 1", supposed so form a small campaign.
From the back of the book (translated):
In charge of the British Museum a party of fearless adventurers travel to Argentina to find two legendary gemstones. This supposedly simple mission appears to become a dangerous task and culminates in meeting a ruthless old villain, who sets out to draw whole mankind into doom. In addition to this, the investigators aren't the only one in search of these gems. Competitors from Germany and the USA are not asleep and do everything to claim the stones for themselves. In the wilderness of Argentina fateful encounters and dramatic races occur. Only one group may become the victor. A horrible fate awaits the losers...