Summering on Cape Cod in 1985, precocious young Lily befriends an enigmatic girl her age named Mesa. Through their shared time biking the quaint land and exploring the depths of their true selves, they unearth powerful feelings for each other.

One summer after an impassioned romance with a girl from out of town, 17 year old Mesa yearns to better understand herself and reconcile with her past on the peninsula of Cape Cod in 1986.