Discover Series Books for Babies & Toddlers Is the most exciting time at your house when a fire truck rolls by? FIREFIGHTER brings 25 full-color photos to your fingertips. Each photo has a title beneath it so you'll never be stumped when your child points to a fire truck and asks for a detailed description. Used as a jumpstart for interaction, Discover Series Picture Books are a great way to introduce new words, images and ideas to kids.