Alycat is planning a sleepover with her friends when Luna calls. Alycat has trouble hearing her friend over the crackling phone line, but it sounds as though she can't come to the sleepover and that she has a very big secret to share. When the rest of the kittens arrive, they gather to play games and tell spooky stories. What if Luna's news is as terrifying as the stories of alien dogs and giant mice the kittens tell around the campfire? The themes of the books in the Alycat Series all reflect a reliance on friendships, imagination, and creativity towards problem solving. In this adventure, the characters of Alycat and her friends show young readers that things aren't always as scary as they may seem. A sleepover checklist is included! People are talking. The Alycat Series features: Alycat and the Thursday Dessert Day, Alycat and the Monday Blues, Alycat and the Friendship Friday, Alycat and the Tournament Tuesday, Alycat and the Cattywampus Wednesday, Alycat and the Sleepover Saturday, and Alycat and the Sunday Scaries. The books in this series have won more than 17 awards, including the NYC Big Book Award, the Mom's Choice Awards, and the Next Generation Indie Book Awards; have been featured in Kirkus Reviews and Publishers Weekly; and have appeared in the Oscars celebrity swag bag and the Grammy Awards gift bag.

Sarah Ferguson, the Duchess of York, featured Bourque and her life-size mascot, Alycat, on her popular YouTube channel Little Red News.