Anthony Horowitz 
Diamond Brothers in The Falcon’s Malteser [PDF ebook] 

A hilarious story about the world’s worst detectives by the bestselling author of the Alex Rider series, Anthony Horowitz.Meet the Diamond Brothers, the world’s most defective detectives, by the author of the number one bestselling Alex Rider series. When a dwarf comes into the office and leaves a package, Tim Diamond, the world’s worst private-detective, is faced with his toughest case yet. The office is ransacked and the package is found to contain simply a box of Maltesers. Who was the dwarf … and why was he murdered shortly after his visit?