PREETY GIRLS BY KARIN SLAUGHTER

Prepare to be blindsided by a thriller so dark, twisty, and emotionally raw, it has been lauded as a "book of the year" by authors like Lee Child. Karin Slaughter's Pretty Girls is a visceral, unputtable psychological suspense novel that unearths the horrifying secrets families keep and the devastating cost of silence.

More than twenty years ago, the Carroll family was shattered when their eldest daughter, Julia, vanished without a trace. The two surviving sisters, Claire and Lydia, haven't spoken since, driven apart by grief and secrets. Claire became the glamorous trophy wife of an Atlanta millionaire, while Lydia struggles as a single mother to make ends meet.
Their wary truce is violently forged when Claire's husband is brutally murdered. This new tragedy forces them to confront their shared past, revealing a disturbing connection between the murder and the cold case of another missing teenage girl. As they delve into the dark underbelly of their family history, they uncover a world of violence, betrayal, and a horrifying conspiracy that someone will kill to keep buried.
If you loved Gone Girl or the works of Gillian Flynn, this is your next obsession. Be warned: this book is intense, featuring graphic and disturbing content, but the emotional payoff and shocking twists are immense.