The Stowaway is the first book in the Stone of Tymora trilogy, a young adult fantasy novel co-authored by R.A. Salvatore and his son, Geno Salvatore. The story follows Maimun, a young boy who stows away on the pirate-hunting ship Sea Sprite and encounters the dark elf Drizzt Do'Urden. The book is set during the events of The Halfling's Gem and features Maimun's journey as he tries to survive and prove his worth. 
Plot: A young boy named Maimun, who is guarding a dangerous secret, escapes his village and stows away on the Sea Sprite. He finds an unlikely ally in the dark elf Drizzt Do'Urden, while facing threats from a half-demon and a resentful crew.