Vanished by Mary McGarry Morris
I don't know if anyone saw this book as crime fiction on its publication. It certainly is noir and straight out of the Woodrell universe.
A laborer is lured into helping an attractive woman he sees on the road. He deserts his family and embarks on an odyssey with Dotty, who is a femme fatale of the highest order. She has kidnapped a baby and the three cobble out a life on the road over the course of the next five years. Their fate is further complicated when they run into an ex-con and his family, who come up with the idea of demanding ransom. This is one dark, often heart-breaking tale and amazingly Morris' first novel. Highly recommended. Her other novels aren't bad either.