Dragon's Rock is a novel for young adults by British author Tim Bowler, first published in 1995.
Toby and Benjamin are opposites and have no affection for each other, so when Benjamin arrives to spend the holidays with Toby's family the stage is set for intense confrontation.
He decides to return to Dragon's Rock and replace the stone - maybe then he will be left in peace.
But once there, he realises just what a powerful force is at work, and that he is no longer the only person tormented by this fearsome, dangerous beast.
This article about a young adult novel of the 1990s is a stub.