18-year-old, Alexandra Montgomery, is a fearless girl. No one knows how she's so fearless. One day, she runs into a boy and his gang witnessing a kill. The boys have a secret. Well, it's not really a secret because everyone knows the boys are in a mafia. Alexander Kingston is the leader, he's also fearless, and no one scares him. His mafia is the most powerful and most feared in the world. He is known for being careless and heartless to everyone but his friends and family. Lexi has a secret, though. Lexi is the youngest assassin of all time. Over time, nothing scared her anymore. These two begin to trust one another. They begin to love one another. She became his one and only weakness. He became her strength and her shoulder to lean on. But will he choose her or continue with an arranged marriage?