"Ghosts are pretty common where I'm from. There's a whole dimension of them and everything." Danny shrugs. "Half-ghosts? Not too many of us around. Most scientists don't believe we exist, and I usually try to keep it that way."

Especially from his parents.

He taps his chest.

"Ghosts in my world have a core that kind of works like a heart for humans. Mine's ice. It means I can put out a lot of cold energy."