I'd Tell You I Love You, But Then I'd Have to Kill You

 It is the first book in the Gallagher Girls series. The story revolves around a secret spy school for girls called the Gallagher Academy, where Cammie Morgan, the protagonist, is a student. The twist is that the girls are not allowed to have relationships outside the academy to maintain their cover. Cammie's world takes a turn when she meets a normal boy and starts to question her spy life. The book combines elements of romance, espionage, and humor, making it a fun and entertaining read for young adult readers.