Pretty Baby by Mary Kubica

Heidi Wood has always been a charitable woman. Still, her husband and daughter are horrified when Heidi returns home one day with a young woman named Willow and her four-month-old baby in tow. Disheveled and apparently homeless, this girl could be a criminal—or worse.

Heidi spends the next few days helping Willow get back on her feet, but as clues into Willow’s past begin to surface, Heidi is forced to decide how far she’s willing to go to help a stranger.