In the city of Veridia, they worship Seraphina Moreau as an angel. In the shadows, she is the devil they should have been praying to.

By day, Seraphina is a beacon of charity and grace, her quiet smile capable of disarming the most powerful men in the city. By night, she is a meticulous architect of ruin, a silent executioner who targets the corrupt elite. Her methods are bloodless, her planning is flawless, and her innocence is her most devastating weapon. One by one, the city's untouchable sinners begin to fall.

But two people refuse to believe in the angel.

Detective Miles Miller, a disgraced cop with nothing left to lose, sees a pattern in the chaos. He sees a puppet master hiding in plain sight, and his obsessive hunt for the truth threatens to expose the secrets buried beneath Seraphina's bed of roses.

Isabella Rossi, Seraphina's brilliant and devoted protégée, is the only person Seraphina has ever allowed close. But when a thread of suspicion begins to unravel, Isabella transforms from a loyal disciple into the one threat Seraphina never accounted for?an enemy she created herself.

As her perfectly controlled world is besieged from both sides, the angel finds herself in a desperate game of psychological chess where one wrong move could cause her entire empire of lies to burn. She has played God, and now she must pay the price. But what happens when the devil refuses to pay her dues?

Perfect for fans of Gone Girl, You, and The Silent Patient, Sweet As Sin is a dark, addictive psychological thriller about the seductive nature of evil, the performance of sainthood, and the terrifying truth that the most dangerous monsters are the ones we invite into our hearts.