Suddenly, awesomely, stinkingly rich

As you might guess from the title, The Billionaire's Curse by Richard Newsome is a classic example of good news/bad news. When teenager Gerald goes with his parents to London for the funeral of his great-aunt Geraldine, he (and everyone else) is stunned to learn that he inherited a billion pounds!  BUT (you knew this was coming) while his goofball parents take off on a vacation, Gerald is left behind to solve a mystery: Geraldine left him a note saying she knows she was murdered, and it's up to Gerald to find the killer...before the killer finds him.  Most of the story zooms around a stolen diamond, a snooty gentlemen's club, suspects galore, and a pair of twins who befriend Gerald and offer to help figure out what's going on.  There were a bit too many coincidences for my taste, and I thought the end of story was mighty Indiana Jones-ish, but it was still a fun read.