The Switch by Anthony Horowitz - old paperback

Age :7-11

Anthony Horowitz, OBE is an English novelist and screenwriter specialising in mystery and suspense. His works for young adult readers include The Diamond Brothers series, the Alex Rider series, and The Power of Five series.

On 19 January 2011, the estate of Arthur Conan Doyle announced that Horowitz was to be the writer of a new Sherlock Holmes novel, the first such effort to receive an official endorsement from them and to be entitled the House of Silk.