On a whim, I picked this up in audio because I wasn't sure when I'd get to it on the page. Given how late I am to the party, I'm aware that there's now an entire series of the "wayward children" stories, involving those who have gone through portals to another realm...and now can't find their way back. But this first story is less a classic portal fantasy than it is a classic murder mystery. And when all the inhabitants of the mysterious spooky mansion are more than a little odd, sorting out the suspects can be a problem.
I really enjoyed the worldbuilding behind McGuire's version of portal fantasy. And the protagonist captures the desperation and angst of being a Strange Child doomed never to find her way to the place she belongs. (Been there, though a different flavor of Strange.)