A prized puppy is missing, but ninja princess detectives Ava and Gabby Danger are on the case! Readers in grades 1-4 will help the girls follow the clues and put their thinking crowns on to solve the mystery. Can they find the little champ before the kingdom's hot dog race? Princesses Ava and Gabby Danger love martial arts and putting on their thinking crowns to solve mysteries in their castle, their classroom, and beyond in the Kingdom of Klue. Joined by their sidekick, Erk, a frog they will never kiss even if he might be a prince (ick!) the ninja princess detectives find the clues, follow their hunches, and save the day.