The End of Her by Shari Lapena
This is the second Shari Lapena novel I've read, and wow! she can really spin a heck of a domestic thriller. The End of Her is about Patrick and Stephanie, a happily married couple and new parents to twin girls. Patrick is a partner in an architectural company, and Stephanie has left her job to stay home with the girls. Both are struggling with having two colicky babies that don't sleep and cry all the time. Stephanie is so sleep deprived she forgets to shut off the stove, and sometimes leaves the front door wide open. She just can't remember doing those things. There's not enough coffee in the world for her to stay functioning normally. Visits to a pediatrician for help don't really go as planned; the girls' doctor simply says they will stop being colicky sometime, and it will end abruptly. Meanwhile, Stephanie, and Patrick, too, are having major sleep deprivation. One day, a woman from Patrick's past appears, and threatens to blackmail Patrick if he doe...