The Elder Brothers and the Padstow Crystals

Jamie and Nicky live very normal lives in a neat modern home in London but that is all about to drastically change. Their parents have disappeared. Now, they are being sent to Cornwall to live with their aunt and uncle in a run-down mansion in a village where no one will talk to them; no one that is except the person who keeps leaving them strange, but wonderful messages.
They need to find out if there really is such a thing as magic, and how that will help them rescue their father from his dangerous and frightening kidnappers. Jamie and Nicky are in a race against time to save their father. Will they be able to pull it off?