Avril Crump and the Lucky 13

Eddy is invited to a mysterious party but she does not know that she is in danger from the evil Gideon Blunt. It's a frantic race against time to stop Gideon from harming Eddy. Will Avril and Dr Wetherby's flying scooter get them to the party on time to save Eddy? This is an adventure set in a ruined castle on Christmas Eve.