Maybe because InterWorld wasn't written by Gaiman alone, but in a collaboration with Michael Reaves, I can't help feeling it would've been better executed as the animated something they wanted at first. This doesn't read like a Neil Gaiman novel. It's very YA-ish (middle grade, even?), and I can picture my younger self enjoying it very much, but I've read my fair share of Gaiman stuff over the years, and I felt let down by this one.

It is what it is: your average teen fantasy/sci-fi adventure story.