On a trip to the science museum, Maddy learns that bees are fast becoming endangered and is determined to do something about it.

Griswald is a little gnome who lives in the rain gutter. The one day, a storm washes him down the drainpipe into an old rain barrel. At first, Griswald is unsure about his new home, but soon he meets all the animals, birds and plants that live in the garden and has wonderful adventures with his new friends. Through the seasons, Griswald explores a whole new world in the garden, gets into sticky situations, helps his new companions and even learns...

Helping Grandfather's friend, Mr. Yee, who has broken his arm and cannot tend a beloved vegetable plot, the Alden children begin investigating when they discover that vegetables have gone missing and that someone is vandalizing the garden.