The Tolkien novel following Bilbo Baggins’s adventure with thirteen dwarves is The Hobbit.
Published in 1937, The Hobbit introduces Bilbo as a comfort-loving hobbit who is recruited by the wizard Gandalf and a company led by Thorin Oakenshield. Their goal is to reclaim the Lonely Mountain and its treasure from the dragon Smaug.
The book began as a children’s fantasy story, but it contains ideas and characters that became central to Tolkien’s larger mythology. Bilbo’s discovery of a mysterious ring during the journey provides an important connection to The Lord of the Rings.
A common mix-up is assuming that Bilbo travels with twelve dwarves. The company has thirteen dwarves, while Gandalf and Bilbo join them as the wizard and burglar, respectively. The novel’s full title is The Hobbit, or There and Back Again.