Willa lives on the upper West Side of Manhattan with her divorced father and her younger brother and attends fifth grade with her best friend Ruby, and she likes things to be a certain way, because it makes life manageable even with her Sensory Processing Disorder; she certainly does not like surprises, and her father has just thrown her a big one: he has been dating Ruby's mother, and suddenly Willa's life seems to be spiraling out of her control--and...

Five students who meet in freshman orientation agree to write notes to their future selves and promise to reunite in exactly four years when they are ready to graduate from high school.

Mara's niece, who is only one-year-younger, moves in bringing conflict between the two teenagers because of their opposite personalities.