Pilgrim of the Sky by Natania Barron

Maddie’s boyfriend Alvin disappeared years ago, and she’d finally decided to sever her ties with Alvin’s mother and disabled brother Randy so she can move on with her life. Little does she realize that the trail of Alvin’s disappearance leads all the way down the rabbit hole, and that he was hiding secrets about himself and her that she can scarcely imagine.

( The spoilers I reference won't actually make much sense if you haven't read the book. )

Overall: I was unenthused. It managed to combine my biggest complaints about a bunch of other books (Fair Coin and mid-plot genre-shifting; Matchbox Girls and unnecessary worldbuilding exposition) with a main character who irritated me and a plot that wasn’t enough for its trappings.

Disclosure: I know the publisher personally.