My Heart Is Either Broken by Megan Abbott
A husband and father slowly begins looking at his wife's behavior differently than he had previously in their relationship after their daughter goes missing. As newspaper reporters and the police officers begin questioning his wife's story, only ever so slightly does he begin to think she's responsible. Then suddenly one night she remembers details that had slipped her mind and soon they are reunited with their baby daughter. But one night he walks into his daughter's room to find his wife looking at her with an expression that makes him very worried. This is a great story with several twists at the end as to whom is the dangerous woman in this story.