Mia Carter looks harmless. Soft smile, quiet manners, invisible in plain sight.She is the Ghost — the assassin the FBI has spent years trying to catch. She never chose this life. At thirteen, the Black Circle murdered her father and took the rest of her family. They turned her into a weapon and kept her loyal by holding the people she loved hostage and now they've given her one final order: infiltrate the home of FBI Special Agent Ethan Cole, steal the evidence he's gathered against them, and if he gets too close, eliminate him.Getting inside is easy but staying is not.Ethan is nothing like the cold, relentless hunter Mia expected. He's careful, protective and quietly kind in ways that catch her off guard. Late-night conversations turn into something neither of them planned. Suspicion slowly becomes attraction, and with every passing day, Mia finds it harder to remember why she came.But Ethan has his own reasons for hunting the Ghost. Years ago, his mentor was killed during an investigation into the Black Circle. The Ghost was blamed, and Ethan has never stopped looking for her and now the quiet housekeeper in his home is leaving traces she can't quite hide, and the walls between them are getting thinner by the day.Mia believes this may be her only chance to earn her family's freedom. Ethan believes this may be his only chance to finally catch the assassin who took the only family he had left.Neither of them is ready for what happens when the truth comes out because the Black Circle is still watching and they are not finished with either of them.