The Falcon's Malteser

From the # 1 New York Times bestselling author of the Alex Rider series. 

When the vertically-challenged Johnny Naples entrusts Tim Diamond with a package worth over three million pounds, he’s making a big mistake. Tim Diamond is the worst detective in the world. Next day, Johnny’s dead, Tim feels the heat, and his smart younger brother, Nick, gets the package—and every crook in town on his back!