This is new. It’s usually me who says things like this, not Rose. “But we’ve got Mitch,” I say, “the person who actually hid the Box. He’s just got the tattoo. Come on. Let’s see if she’s remembered anything.”

We find Mitch and Win in the captain’s cabin. Rose must have given her back her tattoo kit because Mitch is floating in her bath, brushing a feather over the tip of her little finger. Pink smoke rises in the air.

“What do you think?” she says, wiggling her finger. “It’s a rosebud because I found you, Rose.”

“I love it,” says Rose, but she only manages a small smile.

Win is over by the shelves, looking through Mitch’s ingredients. He picks up a jar of murky water and goes to open it, but before he can unscrew the lid Mitch has tapped some grains on to the palm of her hand and blown them in his direction. Frost rushes over his fingers, freezing them to the jar.

“Oww!” he complains. “Will you stop doing that?”

“Only if you stop touching my stuff.”

“We’ve got a job to do,” says Rose, reaching past the bath and opening the window of the cabin. A flurry of snow drifts in. From here we have a perfect view of the frozen waterfall with its two sharp teeth. “The Box is out there, somewhere, and we’ve got to find it.”

“Yeah, but I don’t know what this means, do I?” says Mitch, propping herself up next to Rose and pushing up a wet sleeve. We stare at the tattoo.

“Together we can work it out,” says Rose. “We have to get to the Box before Crowky. Arthur and I are older now and our worries are different.”

Mitch narrows her eyes. “Different how?”

“They’re bad, Mitch, trust me,” says Rose. “They’re the kind of things we can’t say out loud.”

Mitch nods. “Let’s do it then.”

The four of us gaze at the picture. “We’re in the right place because that’s obviously the Vampire,” says Rose, pointing at the two curving teeth. Our eyes move from the picture to the real thing. “And the mountains are the same, and so is the river . . . but it’s hard to see where the Box is supposed to be.”

“That thing looks like an arrow.” Win points at the symbol pointing toward the Box. “Or is it a tree?”

I look out of the window. “But that doesn’t make any sense. It means the Box is hidden at the bottom of the sea.”

“Maybe it is!” says Mitch. “I mean, I am a merwitch.”