The sea and its secrets always fascinated the Trevelyan brothers. It is on an expedition to a remote Pacific atoll that Mark dies--a natural death Mike is told.

There was no love lost between the brothers. But the circumstances surrounding Mark's death were suspicious enough to force Mike to investigate--even without the series of violent attacks on him that followed.

There were just two clues--a notebook in code and a lump of rock--enough to trigger off a hazardous expedition, and a violent confrontation far from civilization.