Usborne The Peculiar Peggs of Riddling Woods

This is the story of a sleepy town called Suds. A place where stories fill the air of children who keep turning grey and disappearing without a trace… Poppy and Erasmus are certain there's something peculiar going on in Suds, and they're determined to unravel its secrets. But when they discover the answers might lie in the darking and twisting woods, can they find the courage to creep inside and solve this riddling mystery?