When her parents think she's 'in another world' little do they know, she really is. Together with her little brother Fred, Frankie can disappear to Thoughtopolis, a magical world inside her head. Thoughtopolis is an adventure-land, filled with the best things an eleven-year-old can imagine, until Frankie gets trapped inside and it suddenly stops being her fun refuge. Frankie must journey to uncover a secret buried in the heart of Thoughtopolis that will change her world forever. Can she discover the truth, face a great loss and find her way back to the real world?