Lost in the jungle! Bruno is on a trip to Colombia in his school holidays. His anthropologist uncle has taken him along on a visit to Don Rafael de Castillo, a descendent of a great explorer who is claimed to have discovered a lost City of Gold. But the secret of the city died with the explorer - until now... His uncle and Don Rafael believe they know where to find the city and Bruno gets to go along for the ride. But when the two men are kidnapped, Bruno is left to solve this new mystery on his own. With Paolo and Christina, the Don's children, he must set off into the wilds of Colombia to find the city - and bring his uncle back. Bruno must build a raft and negotiate wild river rapids, make camp, defend his friends from wild animals and keep them all alive in the jungle. This is a fast-paced, exciting new adventure full of real survival details and gruesome tips.