Thirteen-year-old Samantha faces some stiff competition when a new friend is interested in the same boy Samantha has a crush on, and another girl starts an internet version of her business of passing secrets, unread, from one classmate to another.
With help from her best friend Ava and Ava's boyfriend Noah, Hannah is recovering from being dumped by her boyfriend Sebastian, but on the first day of their senior year in high school, Ava learns that Hannah and Noah betrayed her while she was away.
Scarlett hates everything about her new all-girl school, but when she receives a strange letter that contains four truths and a lie and hints at a secret she is hiding, she soon realizes that this new school will not be dull.