In this story, John Buchan explores Africa together with his friend Lawson. During their expedition, they find an astonishing place and they decide to settle there. But after a while John decides to leave Africa, while Lawson decides to stay. When Buchan returns, after some years, he finds Lawson in terrible condition and not willing to tell him why. However, Lawson's warden, Mr. Jobson, believes that the problem comes from the grove of trees in their property. What is the reason for Lawson's poor condition? Will Buchan and Jobson find a way to cure their friend? Will they have to destroy the forest to release him from the spell he is under? Find all the answers in John Buchan's mysterious novel "The Grove of Ashtaroth".