Dany Ashton is invited to spend a holiday at her stepfather's house in Zanzibar - the mysterious 'House of Shade', where Captain Rory Frost buried a fortune in gold a hundred years before - but even before her plane takes off there is a stolen passport, a midnight intruder, and a murder.

And it isn't long before the air of gaiety and nonchalance that opens the tropical house party fades into dawning terror, as Dany and the rest of the house-guests learn that one amongst them is determined to take the hidden treasure - at any cost.