One bright day, Mouse and Momma head outside to play. The wind blows in something feathery and plump: a bird, and something wiggly and pink: a worm, and something green, who hops and leaps: a frog. But before it's time to go back inside, Mouse finds something that's soft and new with petals: the prettiest flower he's ever seen! Could it mean spring is "finally" here? The New York Times bestselling Mouse is back, and he's discovering the magic of spring and the many changes that blossom around him. But Mouse learns some things never change with the seasons: Momma's love for him and his love for his momma.