Sweetheart, Evil Heart (Fear Street Seniors, No. 8)

Ty Sullivan thinks he can get away with dating three girls at the same time while letting them think he's being faithful. Ty gets away with this until he starts exchanging valentines with a girl named Amy in Shadyside Cemetery. Amy sounds hot, but she's also jealous. And when Ty continues to see his other girlfriends, Amy begins threatening them. Ty must find out the truth about Amy before it's too late for all of them! ,