From the bestselling author of the Ranger in Time series, Kate Messner, comes an adventurous new chapter book series about a family dedicated to rescuing animals. Ivy and Ezra are "critter couriers" whose family volunteers to transport injured and orphaned animals to their local wildlife hospital. When they discover a baby river otter with a hurt leg, Ivy worries about the little otter being separated from its family--a feeling she knows all too well. She's struggled to make new friends since her twin cousin BFFs moved away. Taking on a big project for the wildlife hospital keeps her busy, but can she find the confidence she needs to make it a success, build new friendships, and help the otter heal enough to return to the wild?