THE COUPLE NEXT DOOR by Sheri Lapena

Great book.  Really enjoyed it .  Anne and Marco's babysitter cancelled at the last minute.  They are just going to be next door.  The homes have a shared wall.  What could possibly happen if they took the monitor and checked on her every half hour?  Turns out a lot.  When Anne and Marco get home at 1:00am their baby is missing.  Will she be alive and who would take her?  I'm still not sure which couple is the couple next door.  They both have secrets to hide. Very interesting book.  Must read!