Prank Patrol - Series 1 - Haunted Hall

Children's series in which people play tricks on their friends. Helena wants to prank her friends with a guided tour to a supposedly Haunted Hall. After a day of helping Professor Prank to create eerie effects, she accompanies her friends to the Hall. How will the girls react to the scary sounds in the Hall, the Knight's armour that lurches towards them and the ghostly appearance of Lady Bramall?