After being recently orphaned Rose must live with her aunts, the matriarchs of her wealthy Boston family. When Rose's guardian, Uncle Alec, returns from abroad, he takes over her care. She becomes happier and healthier while finding her place in her family of seven boy cousins and numerous aunts and uncles. Each chapter describes an adventure in Rose's life as she learns to help herself and others make good choices.

Peter's mischievous cousin, Benjamin Bunny, persuades him to go back to Mr. McGregor's garden to retrieve the clothes he lost there.

While attending a fancy banquet, Timothy and his cousins go out into the gardens and overhear a conversation that draws them into an unexpected mystery.

The three cousins are stuck babysitting their bratty third-cousin Patience and when she disappears while they are visiting an old mansion, they must investigate.

Bradley, Brian, Nate, and Lucy follow clues to find whoever left a rabbit in their first-grade classroom on Valentine's Day, because they are worried the rabbit will get sick and die of loneliness.

Seven-year-olds Bradley, Brian, Nate, and Lucy make observations and gather clues that convince them that their older siblings, cousin, and animals have been captured by hungry space aliens.

While visiting Lake Misty Pines, the three cousins hear about an archaeological treasure that may lie on the island in the middle of the lake and try to track a mysterious stranger.

Sarah-Jane and her two cousins solve a mystery involving an antique locket they plan to give their favorite baby-sitter.

Cousins Jesse and Daisy always knew they would have a magical adventure, but they are not prepared when the "thunder egg" Jesse has found turns out to be a dragon egg that is about to hatch.

When Sarah-Jane discovers that several other people want the same old favorite books which she has just found at a benefit for the library, she and her cousins find out why.