The most important rule of Unicorn Day is to have fun, fun, fun!

The unicorns are celebrating their favorite day of the year, complete with rainbows, cupcakes, butterflies, and all sorts of joyful things. But when it's revealed there's an impostor in their midst, the party comes to a screeching halt...

Will the unicorns welcome all and continue their fun in all its glittery glory?

A clever, colorful, and over-the-top picture book about unicorns, celebrations, and most importantly, friendship.

Diana Murray writes stories and poems for children. She is the author of Grimelda, The Very Messy Witch, Ned the Knitting Pirate, City Shapes, One Snowy Day, and other picture books. Her poems have appeared in magazines, including Highlights for Children. She grew up in New York City and still lives nearby with her firefighter husband and two daughters.

Luke Flowers is an illuminator of the imagination that spends his days (and most nights) in his cozy creative cave illustrating and writing children's books. He lives in Colorado Springs, Colorado and you can find him online at lukeflowerscreative.com