Mary Beth is a marine biologist that gets annoyed when a dog called Zeus stows aboard her research boat. Nevertheless she is intrigued when the intrusive canine makes best-friends with her captive dolphin, Roxanne. She falls in love with Zeus's owner, Terry, a musician who rides a bike.

Waxing nostalgic about the bittersweet passage from childhood to puberty, four childhood girlfriends — Teeny, Chrissy, Samantha and Roberta — recall the magical summer of 1970. During their walk down memory lane, they reconcile experiences with boys, secrets, bullies and more.