The End of Her by Shari Lapena

In upstate New York, Stephanie and Patrick are adjusting to life with their colicky twin babies. The girls are a handful, but Stephanie doesn’t mind being a stay-at-home mom, taking care of them while Patrick does the nine to five to pay the bills.

When a woman from Patrick’s past drops in on them unexpectedly, raising questions about his late first wife, Stephanie supports her husband wholeheartedly. She knows the car accident all those many years ago was just that–an accident. But Erica is persistent, and now she’s threatening to go to the police… Read more.