When it comes to her mother in law, Lucy can't win. After losing her own mother at too young of an age, Lucy is hopeful that her husband's mother, Diana, will help fill that void. Diana, however, is nothing like the maternal figure for which Lucy had hoped. And soon, Diana's dead and things unravel. The book focuses mainly on the relationship between Lucy and Diana, but also outlines Diana's own past and how it's impacted the woman she is today (well, at least until her untimely death). The only thing is, no matter how poor the relationship between Lucy and Diana, there are others who may hold responsibility in the death of the family matriarch. As with many thrillers, the ending isn't what you'd expect.