The hero of the novel “The Ruby of the Great Lama” - inventor Olivier Desroches - is building an aircraft and preparing to travel to Tibet. He raises money for the construction of the device from the sale of two inherited rubies. As a result, a rumor spreads in London that Desroches is flying to develop the richest ruby mines. Among the crew members and passengers, a group of conspirators is formed who are trying to take over the plans for the ruby deposits. The fascinating details of the journey, love affairs, a terrible conspiracy and a happy ending in which the secret of the inheritance is revealed will not leave the reader indifferent from the first to the last pages of the novel.