The Gods of Easter Island. Mammoth figures, hacked out of stone with primitive hand tools. Hundreds of them. They're all alike, long eared, long nosed, thin bodied figures with a top knot of red stone balanced on their heads. When the Dutch admiral Roggeveen first landed on the island on an Easter Sunday in 1722, he met the descendants of the people who had built the statues. Most of them were pure Polynesian, and the island was dotted with dozens of secret caves, shelters created as refuges against some unknown invader. To this day, no-one knows what they feared, but some people, like the well-known archaeologist Professor John Tillotson had theories...