When their grandmother Sylvie is rushed to hospital, Ivy Sparrow and her annoying big brother Seb cannot imagine what adventure lies in store. Returning to Sylvie's house, they find it has been ransacked by unknown intruders - before a mysterious feather scratches an ominous message onto the kitchen wall. A very strange policeman turns up on the scene, determined to apprehend them ... with a toilet brush. Ivy and Seb make their escape - only to find themselves in a completely uncommon world, where ordinary objects have amazing powers. The forces of evil are closing in fast, and Ivy and Seb must get to the bottom of a family secret ...before it's too late.