The Cry of the Halidon
Robert Ludlum
 The story concerns a geologist, Alex McAuliff, who is commissioned to undertake a survey in Jamaica. The survey must be carried out in secrecy. In common with other Ludlum novels the lead character discovers there is more to the deal than expected and McAuliff is enlisted by British Intelligence. The story develops as McAuliff's resources and abilities are tested eventually leading him to a secret organisation hidden in the Jamaican mountains. It too describes a secret organisation. fr:Le Secret Halidon