What books did Jack Trelawny write?

Jack Trelawny did not write any books. He was a real person, a Cornish adventurer and friend of the poet Percy Bysshe Shelley.

You might be confusing him with J.T. Trelawny, an American writer who wrote historical fiction, including the book "The Adventures of a Younger Son."

It's possible you're also thinking of Edward John Trelawny, a different historical figure who was an English adventurer, writer, and friend of Shelley and Lord Byron. He wrote several books, including:

* "Adventures of a Younger Son" (1831) - a fictionalized autobiography

* "Recollections of the Last Days of Shelley and Byron" (1858) - a memoir

* "The Life and Adventures of a Younger Son" (1876) - an updated version of his earlier book

* "Records of Byron, Shelley and Their Circle" (1887) - a collection of letters and other documents

It's important to distinguish between these different individuals to avoid confusion.