A painfully shy old man has approached Professors Gadling, Gauntraker and Ampersand with an extraordinary archeological find: early human remains that don't fit in with anything known to science.

Soon, Sam, Zara, Ben, Marcia and Adam are joining the professors on an expedition to a remote island in South-East Asia to investigate further.

But the island contains a secret more astonishing than anything they could have imagined, and a dangerous, deadly enemy is on the trail . . .