As soon as the School-bus drew up outside the castle, Jamie felt sure that he’d been there before.

He frowned, trying to remember. He was certain that once you got inside the old gate-house there was a wide passage with a curved roof and then fourteen stone steps leading up to the door that no-one was supposed to open.

So while the others ran excitedly across the draw-bridge shouting to one another Jamie hung back, staring up at the high stone walls and the two half-ruined towers.

“Don’t drag behind, Jamie,” shouted Mr Twemlow, bringing him back to earth with a bump.

“Judy!” he called in a loud whisper, and Judy stopped and looked back.

“Whatyawant?”

“Lend us your torch.”

“Why?”

“I’ll give you my Mars Bar.”

“A whole one?”

Jamie nodded.

“Hurry up, Judith,” shouted Mr Twemlow, a long way ahead by now. “There you are.” Judy thrust the torch into Jamie’s hand, took the Mars Bar and ran after the others.