Dora & Boots jump into a book of nursery rhymes to help a lost little lamb return to her owner, Mary.
Dora and Boots discover a giant sized nursery rhyme book sitting on the path, when a lost little lamb jumps out of the book looking for Mary. Dora, Boots, and Little Lamb enter the nursery rhyme book and check the Map find out how to get Little Lamb home. Map says that they have to go past the waterspout, jump over the moon to find Mary at her own house. Map mentions that there will be some star catching. After checking out other nursery rhymes and catching stars, they meet Peter Piper who had a bush of pickled peppers. Peter Piper, Dora, Boots, and Little Lamb pick out picked peppers while stopping Swiper. Afterwards, everyone took a taste on their pickled peppers, including Dora, who admits that she has not tasted a pickled pepper before. So, she took a bite and realized that she loves pickled peppers. After their snack, Dora and Boots headed off with Little Lamb to the waterspout, where they sing "Itsy Bitsy Spider" to help Spider turn off the waterspout. Later, Dora, Boots, and Little Lamb check out another nursery rhyme called "Humpty Dumpty", who falls off his wall, and they play a jigsaw puzzle game to put him back together. After fixing Humpty Dumpty, they head off to find the moon where they check out another nursery rhyme called "Hey Diddle Diddle". They see a cow and hopped onto her. Dora, Boots, and Little Lamb to tells us the cow how to "Jump" over the moon in Spanish. After jumping over the moon, it turns dark and Glowy helped light the way down. After riding the cow over the moon, Dora, Boots, and Little Lamb see 3 men in a tub-car. They splash into a mud puddle and got dirty, but they clean themselves up with soap they had gotten from Backpack. After reaching Mary's house, Dora, Boots and Little Lamb jump out and Little Lamb reunites with Mary. The episode ends with Dora and Boots singing "Mary had A Little Lamb".