Books with title Abby's Un-Valentine: The Baby-Sitters Club, Book 127

Valentine's Day is Abby's least favorite holiday. Mushy stuff like valentines, red hearts, and a school dance turn her into a Valentine's Scrooge. When Ross Brown, a perfectly nice guy in Abby's English class, invites her to the dance, Abby tries to set him up with her twin sister, Anna.

Trying to cheer up her twin, Anna, who has been diagnosed with scoliosis, Abby fears that the condition is driving them apart when Anna seems to not want Abby's help and begins to do things on her own.