18 year old Callie's life falls apart the day her father dies. What Callie doesn't realise is how much her life will change when she gets introduced to the "Abaddon Operation", a secret spy agency, and is asked to work for them as a spy in Unit 5. If being the only girl in her unit of 4 boys wasn't hard enough, one decides to take it upon himself to make her time there a lot harder than it needs to be. TW: dark and mature themes will be explored in this book