Spelunking through hell : a visitor's guide to the underworld / Seanan McGuire.

Enhanced descriptions from Syndetics:

Seanan McGuire's New York Times -bestselling and Hugo Award-nominated urban fantasy InCryptid series continues with the eleventh book following the Price family, cryptozoologists who study and protect the creatures living in secret all around us.

Love , noun :
1. An intense feeling of deep affection; may be romantic, filial or platonic.

Passion , noun :
1. A strong or barely controllable emotion.
2. Enthusiasm, interest, desire.
3. See also "obsession."

For Alice Price-Healy, finding her missing husband isn't just a mission: it's an obsession, the thing she has willingly given up every other aspect of her life to pursue. And after more than fifty years, she finally has confirmation that he might be alive out there. She may even have a direction. Now, if she can just keep herself from getting killed before she reaches her destination, she might be able to finish her seemingly endless quest.

All she wants is a happy ending. That's the only thing the universe has never wanted her to have.

Fifty years of running through dimensions without a lot of concern for making friends has left her with more enemies than allies, but she's still got a few places to turn, including Naga, the professor of extra-dimensional studies and giant snake-man she met when she was seven, Helen and Phoebe, the Ithacan satyrs, and Cynthia, the owner of the Red Angel Tavern.

Where she can't turn is to her family, back on Earth and tired of her dimension-hopping obsession. They wrote her off as unreliable long ago, and are unlikely to join what looks like one more wild goose chase.

But is it? Or is this the time Alice finally brings Thomas home to stay?