Stone of Tymora is a series of fantasy novels for teens written by scifi and fantasy author R. A. Salvatore and his son, Geno Salvatore. The series is R. A. Salvatore's first collaboration with his son, and features Salvatore's drow character Drizzt Do'Urden. The first book in the series is The Stowaway. It was released in October 2008. Source: Wikipedia (en)