Justin Case: Shells, Smells, and the Horrible Flip-Flops of Doom (Justin Case Series, 2)

Rachel Vail is the author of children’s books including Justin Case, Sometimes I’m Bombaloo, and Righty and Lefty. She is also the author of several books for teens and middle grade readers, including If We Kiss, You Maybe, Gorgeous, Wonder, and Never Mind, which she wrote with Avi. Vail was born in New York City and grew up in New Rochelle, NY, just down the street from her future husband, though she didn't know that until much later. She attended Georgetown University, where she earned her B.A. in English and Theater. She lives in New York City with her husband and two sons.

Matthew Cordell is the author and illustrator of Caldecott award winner Wolf in the Snow, Trouble Gum, Another Brother, hello! hello!, and Wish. He has illustrated the books of renowned authors including Philip Stead (Special Delivery), Rachel Vail (the Justin Case series), and Gail Carson Levine (Forgive Me, I Meant To Do It). He lives outside of Chicago with his wife, the novelist Julie Halpern, and their two children.