The book "Sailing on the Alert: An Essay on a Treasure Hunt on the Desert Island of Trinidad" by E. F. Knight tells a fascinating story about a group of adventurers who go on a treasure hunt on a mysterious desert island. Under the leadership of the captain of the ship "Alert", they embark on a dangerous journey in search of treasure and face a series of challenges, mysteries and dangers. Every step brings new discoveries and mysteries, and adventures on the island of Trinidad reveal the secret hidden in the depths of its jungle. Readers, together with the heroes of the book, will experience incredible adventures and feel the atmosphere of mystery and danger that reigns on this mysterious island.