LOVED it. 
 Derek Landy is really good at writing teenage girls. And by that, I mean that not only is he good at guessing what could be in their head (while making Amber different from Valkyrie), he's also really good at not judging them. Amber is a fangirl, and not once is that shown as a bad thing. And that deserves to be noted, because it's NICE, for once. 
 He's also good at writing in general. His characters are funny, you get attached to them easily, and yet they are allowed to have their flaws, even Amber, who is as complex as Valkyrie was. 
 The thing is, obviously, this is not Skulduggery Pleasant. It's a different world, with different rules, different stakes. And in all this difference, I found it just as enjoyable. 
 Fans of fun yet sometimes terrifying supernatural roadtrips: this book is for you. 
 (It would also make a great TV show)