Costa del Corpse. Simon Turing, #3

Whatever you do, don't eat the paella!Simon Turing is on holiday in southern Spain and things are not going at all well. The hire car breaks down on the way from the airport and, while phoning for help, Simon hears a cry of distress from a nearby orange grove. He arrives to find a man lying dead in a ditch. By the time the authorities arrive, however, the body has disappeared. The police think Simon must have disturbed a tramp who scarpered when he went to call for an ambulance.
Either that or he is suffering from sunstroke. But Simon knows a dead body when he sees one. Worse is to come when he and his girlfriend arrive at the villa of a family friend. All is not well in the Franklin household. Could somebody here have had something to do with the body in the ditch? And could a member of the family be about to suffer a similar fate?