Visiting friends and family on Cape Cod, the Silver Sisters resolve to avoid fighting all summer only to have their intentions tested by disputes and ambitions that prove to be more challenging than expected.
When their parents, a screenwriter and a film editor, go off on summer projects, Marigold, twelve, Zinnia, eleven, and Lily, five, must visit their Great Aunt Sunny in Cape Cod, where they learn much about themselves and each other and grow closer than ever.