A peaceful alternative mystical land called Ledremain is attacked by creatures known as 'Gloamins'. Two young girls escape to earth and hide in a magical attic for their protection. A young girl called Freya, who lives downstairs, discovers their secret. The three teenage girls and their magical sketch book travel through a painting on the attic wall. They embark on an adventure to rescue a group of children. They must also prevent the Gloamins from finding a key. This key would unlock the attic window and allow the Gloamins to gain direct access to earth.