Secret Seven - Secret Seven No. 1 (Paperback)

In this, their first adventure, the seven super-sleuths are on the trail of some very strange clues. Jack hears strange noises outside his house, and then he discovers a spooky old caravan. The Secret Seven are determined to find out what's going on, and their curiosity leads them, in disguise, through the snow, to an old house, and an exciting mystery...