Meet Scratch, Martie, Lug, and Quito, members of a secret organization called R.O.A.R., or the Rescue Ops Acquisition Rangers. When their boss, Dr. Z, finally calls on them for their first big mission, the team heads to Siberia to retrieve an ancient unicorn horn from the thawing permafrost. Scratch is thrilled at the chance to prove his worth to Dr. Z--but as soon as they land, the team runs into a mysterious enemy determined to take them down.

Scott Magoon has illustrated several acclaimed picture books, including the New York Times bestselling Rescue & Jessica: A Life-Changing Friendship by Jessica Kensky and Patrick Downes, Misunderstood Shark by Ame Dyckman, Spoon by Amy Krouse Rosenthal, and The Nuts series by Eric Litwin. He is also the author/illustrator of Breathe and The Boy Who Cried Bigfoot. He lives in Massachusetts.