The Monster in Our Yard

Lord Frederick de Bevinsby meets up with his friends after two years. He asks them if they've been followed and finds out about a monster in their yard. The group then travels to the soaking valley, where mom and dad are believed to have disappeared. They also find an old friend of theirs who is now called Stiffrod. It's not clear what has happened to Casper since he died 2 years ago.