Eye of Heaven by Jim Mortimore

1842 and an eminent archaeologist by the name of Horace Stockwood steals a stone tablet on Easter Island from the islanders. Escaping to open sea, the huge and ancient monoliths watch him go...

Thirty years on and Horace is desperate to return to the island, having studied the stone his entire life. He needs to know his theories are correct and after raising the Doctors interest, he offers to fund Horaces return.

Their journey however proves more hazardous than anyone would have expected. What is the terrible secret that pushes Stockwood on - and what is his real agenda? Who is trying to stop their mission before it has even begun? As the Doctor begins to piece the answers together, it seems he may become an accomplice to the terrible tragedy that threatens to befall the island. Ancient powers are invoked, and dangerous secrets may soon be secret no longer...