Mary’s Island

The Renton’s decide to spend Christmas at mum’s new house in north Norfolk little knowing that the two crooks who caused them so much trouble in the last adventure, have escaped from prison and have sworn revenge on the family and their protector, Sir Hugh de Quy.

Snowed in by the heaviest fall of snow for years, the family can only sit it out and hope for the best. Hope that the two crooks will soon be found and returned to prison; the trouble is that Brian and his pal Weasel have found a safe refuge on Mary’s Island, just off the coast. At least they were safe on the island until a storm springs up from nowhere and leaves them trapped with little chance of getting off the island and back to the mainland. In desperation, the two men seek another way off the island and manage to find a tunnel that leads all the way to the cellars of the mansion house on Mary’s land. Little do they realise that Sir Hugh is at the mansion with the family and is aware of what they are up to.

The secret opening to the tunnel is eventually found by young Mark and the adventure begins in earnest. Will Sir Hugh be in time to save the boys from being imprisoned deep underground? Or will they remain unfound until it is too late to save them? Only the ancient knight and the sword of Richard the Lionheart can save the day.