Never Odd or Even

Here's a detective story with a difference. Elliot is twelve - and he thinks outside the box. Numbers are his thing - and letters. So when 'the biggest mystery that struck our school in the history of the world' needs to be solved, Elliot is the one to call on. But the solution lies inside the book itself - only it's locked away in a series of puzzles and palindromes. Can you find the clues, solve...