I have since found out a little more about it, as you can no doubt read it's called The Billionaire's Curse (which is an intriguing title) and is written by Richard Newsome. The whole book is published as a result of The Text Prize for Young Adult and Children's Writing which is an annual prize awarded to an 'outstanding unpublished manuscript' with the aim to discover more wonderful new books for young readers, by Australian and New Zealand writers.
If you are an Australian or New Zealand writer you still have until July 31st to enter your manuscript for thsi year's prize. All the info is here. Otherwise there's always next year!
But back to The Billionaire's Curse...
Someone has stolen the world’s most valuable diamond and a constable lies unconscious in the British Museum, two sedative darts protruding from his backside. Not something Gerald Wilkins knows or cares anything about. Not until he finds himself on a private luxury jet heading for London to attend the funeral of a great aunt he has never met. Not until he inherits her estate, worth twenty billion pounds. Not until he opens a bundle of envelopes from his dead great aunt. Was she murdered? Who stole the diamond? And what is the mysterious casket that everyone seems to be looking for? With the help of the Valentine twins, the rat-fearing Sam and the gymnastic champ Ruby, Gerald’s got a mystery to solve. A mystery that will take them into secret passageways, a musty bookshop, an ancient crypt, a ruined tower and a colossal cavern where the secret of a priceless treasure lies protected by deadly booby traps.
The Billionaire’s Curse is an irresistible adventure story with an array of curious characters, ancient folklore and a whodunnit. Young and not-so-young adults, get ready to stay up late.
It's not out until August in Australia, so expect my review around then :)