Dylan's parents run a garage and petrol station in a tiny Welsh town at the foot of the mountains.

He loves helping out because it means he gets to know all about the local residents - what car they drive, their favourite snacks, when they're going on a long journey.

But one day a convoy of lorries trundles along the road and Dylan is determined to find out what is going on. It seems there is something they're trying to hid.

This is a brilliant book. Fun and inventive, great characters, and inspired by a press cutting which described how during World War II paintings from the National Gallery in London were kept safe by being stored in Welsh slate mines.

An adventure, a mystery and a great way to explore the impact of art on children and a community.