Someone in River Heights does not like Lexi Claremont-they've started a burn book blog to ruin her name, and it's happening right before the River Heights Mahoney Celebration where Lexi is being named the Daughter of River Heights. Nancy Drew must go undercover and pose as one of Lexi's good friends to figure out who is doing this to her . . . but now things are becoming much more dangerous when Lexi begins to receive more than just mean blog comments-threatening notes! Will Nancy figure out who is wreaking havoc on Lexi before the big celebration?