Night
(Click on the book to buy Night of Error from Amazon.co.uk)
 

Night of Error,
 
Mike Trevelyan loses his estranged brother under mysterious circumstances, while he is away doing research work on a Pacific atoll.. His death is suspicious.

They are both geologists but whereas Mike follows a straight line, Mark would circumvent any proceedure or flout any convention to grab glory for himself.. There had been no love lost between them.

But then a set of violent events makes Mike realise he has to investigate his brother's death and solve the mystery once and for all.

And what is so important about the heavy lumps of rock that litter the sea bed around most of the world?