Revenge in Rio

From the introduction:

This adventure combines elements of the private detective genre, espionage and the supernatural. It is important in preparing to run this adventure to be suse that the right kind of characters are selected. It is intended for a fairly small party, probably with no more than 4 actual player characters, though they might pick up a henchman or two along the way. There should be one central character. Ideally he should be a private detective or mercenary type who would be willing to undertake a search and rescue mission in a foreign country.