Aug. 2016 — The Girl on the Train by Paula Hawkins
What it's about: This psychological thriller — which was turned into the 2016 film led by Emily Blunt — tells the story of Rachel, an alcoholic still reeling from the end of her marriage to Tom. But the two are hardly out of each other's lives as Rachel becomes involved in a tragedy that not only affects Tom and his new family, but also uncovers devastating details about their failed marriage.