Nofel ddifyr yn sôn am gi bach direidus sy'n mynd ar goll. Dilyniant i Gelert yn Galw. Mae Alun, Jac a Catrin wrth eu bodd yn gwylio'r cystadlu yn Sialens Ieuenctid y Byd yng Nghymru. Ond pwy sy'n ceisio bygwth y Sialens? Ac a oes cysylltiad rhwng diflaniad Gelert, pennaeth C4, sef Cŵn Cymru Cyfrinachol Cyf, a'r cynllwyn hwnnw?
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.
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