They came for an inheritance. They stayed for revenge.

Annabelle Marconi thought she’d already lost everything—first her father to cancer, then her mother in a brutal hit-and-run. But the worst blow comes at their double funeral, when a woman named Mary steps forward… with Annabelle’s half-brother, David.

The revelation of her father’s secret life shatters the family. Still reeling, Annabelle’s siblings make a reckless decision: they invite Mary and David to stay at the family ranch while the estate is settled. Annabelle can’t shake the feeling something is off—and when a strange car begins following her and her sister suddenly falls dangerously ill, her instincts are proven right.

Someone is determined to erase the Marconi family for good. As paranoia spirals into terror, Annabelle must unearth the truth about her father's past—and face a chilling question: What if the enemy is already inside the house?

Perfect for fans of Lisa Jewell and Gillian Flynn, You Don’t Know Me is a taut psychological thriller where blood ties cut deepest—and family secrets turn deadly.