The Usborne Puzzle Adventures:

When Joe, Polly and Sam stumble across an abandoned manor house, with strange, glowing lights, they decide to explore. Soon, they are on the trail of mysterious messages - and then a terrifying ghostly figure appears in a mirror. Could it be real? They'll need all the help you can give them to find out, solving brain-teasers, logic puzzles and curious codes along the way. There are extra clues and answers at the back of the book. Packed full of interactive puzzles and comic-strips, this Usborne classic has been updated and enhanced for a whole new generation of puzzle adventurers.