It's no mystery on how to continue the fun and learning beyond the pages of the book with your own The Curious Casebook of Katie Q. Putt gift set. Included in this STEAM-friendly children's gift set is a paperback copy of The Curious Casebook of Katie Q. Putt, an invisible ink pen with UV light, your very own "Top Secret" notebook to jot down all the clues you discover, a magnifying glass to discover the details, a pair of cool shades to wear, and a roll of "Investigation in Progress" because life is all about staying curious and investigating the unknown.