Age range 14 to 17

Marisa wasn't planning to be a snoop for hire—until she accidentally caught her best friend's boyfriend making out with another girl. Now her reputation for sniffing out cheaters has spread all over school, and Marisa finds herself the reluctant queen of busting two-timing boys.

But when ex-frenemy Kendall asks her to spy on her boyfriend, TJ, Marisa quickly discovers the girl TJ might be falling for is Marisa herself. And worse yet? The feelings are quickly becoming mutual. Now, she's stuck spying on a "mystery girl" and the spoken-for guy who just might be the love of her life…