My daughter a pokemon lover really enjoyed this series. Book 4-Ash has to defeat the Gym Leader Sabrina to earn a Marsh Badge. But only Ghost Pokemon are strong enough to beat her powerful Psychic Pokemon in battle. Now Ash and Pikachu have to spend a haunting night in Pokemon tower to catch a spooky specter. It won't be easy. Ghost Pokemon are tricky, but Ash isn't afriad of any ghosts. Nothing can stop him!