What does spring look like in Inventor's Village? In this book, a child sees it through the eyes of Lotte's sister, Roosi. Roosi's new friends are snowdrops, bluebells, willow catkins, and butterflies.

Roosi jumps in puddles with Lotte, tastes maple sap, and helps frogs ride on ice chunks. Roosi's family decides to make a large flowerbed in the garden. Roosi plants a carrot there as well.

In the evening, everyone listens to a concert of songbirds.

The book with text by Janno Põldma and illustrations by Heiki Ernits takes the toddler to Inventor's Village, where the characters will become familiar and dear to them through previously published books.