Michael, Sven and Carlos are good friends who make up the three amigos. The boys' live in the charming Costa Blanca town called Moraira. The community's scenic seafront and harbour is a Mediterranean haven of tranquillity. The three amigos, whilst enjoying themselves at a near secret cove from the boat, discover a hidden underwater entrance to a sea cave. Their excited discovery, used also by smugglers, leads the boys into a perilous adventure. What follows is an exciting find that will bring glory to Spain. The boys' discovery will also lead to a police hunt, kidnap and rescue with an ending that spells danger and discovery. Their adventure is set to a backdrop of the Moorish invasion of Spain and the Christian struggle for freedom.