House Across the Quaggy. Band 18/Pearl, Paperback

There's something mysterious about the big, old house across the river. So when Archie and his two friends are offered a job tidying the attic, they jump at the chance. But sifting through the mess, they stumble upon something priceless, leaving them with a difficult decision. This exciting story by Chris Powling is illustrated by Martin Ursell.