Daring Do has went into many secrets, but now she must unlock the emerald door that hides the home of Yawns, creatures of Leopards with black wings and white muzzles. They evolved into Yawns for what reason, exactly? That's what Daring must find out. But suddenly, changelings are suspected of stealing the key to their paradise! Will Daring ever find out what caused them to evolve? Only time will tell.