Cyfres Swigod: Gelert ar Goll

An entertaining novel about Gelert, a mischievous dog and member of C4, a detective agency that uses the skills of special dogs. While Alun, Jac and Catrin are enjoying themselves watching the World Youth Challenge competition which is being held in Wales, someone threatens the event, and they have to solve the mystery of whether the threat is connected to Gelert's disappearance.