“But you haven’t opened it, have you?” asks Rose. She’s always believed that opening the bed will make everything inside disappear. We don’t know if this is true, but it’s not something we ever want to test out.

“I’ve not opened it, or even put my head in there,” he says. “I’m only crawling into that cot if you two don’t come back next Sunday.”

I don’t blame Grandad for not wanting to go inside the bed. It was only a few months ago that Crowky dragged him out of my hands, through the bed, and into Roar. Crowky took Grandad to the Crow’s Nest, where he stuffed him by pressing his twiggy fingers down on his body and squeezing the life out of him. Grandad would have stayed like that forever—a lifeless scarecrow—if Rose and I hadn’t gotten to him in time.

Just thinking about Crowky makes the excited tingle in my stomach turn into a knot of worry. I take a step back from the bed as if I’m expecting Crowky’s hand to appear and grab hold of me, or worse, grab hold of Grandad.

“You all right, Arthur?” says Grandad.

I force myself to smile. “Yeah . . . just excited.”

“No he’s not,” says Rose. “He’s worried about the T-shirt.” My sister can read my mind. It’s a twin thing. She knows when I’m happy, sad, worried, or lying. It’s really annoying.

Grandad pats my shoulder. “You don’t need to worry about that old thing, Arthur. It was falling to bits before Crowky got his hands on it. It was my painting T-shirt, remember?”

“Plus Crowky hasn’t got a clue what it can do,” adds Rose. “As far as he’s concerned, it’s just an old T-shirt, not some key that will magically let him out of Roar and into this world!”

Her words don’t reassure me. If anything, they make me feel worse. “But there’s still a chance that Crowky could crawl into the tunnel wearing it, isn’t there?”

“Arthur, it’s a tiny chance,” says Grandad. “It’s not worth worrying about.”

“Great!” says Rose. “In that case, can we get going?”

Grandad laughs. “No way. You two aren’t going anywhere until I’ve given you a bit of advice.”

“Seriously?” says Rose, but he’s already pulling out an old blackboard and waving us toward the sofa.

Once we’re sitting down, he finds a piece of yellow chalk and writes “Grandad’s Top Tips” along the top of the blackboard. “Don’t worry,” he says. “This won’t take long.”

He’s right. It doesn’t take long, because he only has three top tips to share:

1) No running on the dragons. Ride them SENSIBLY.