Underworld office-place where ghost work to help other ghost with the cleansing sins and the repayment of debts for kindness. There are only four ghosts-River, Joan, Hayden and head of it-Boss. River behaves playfully and often messes everywhere, trying to anger others. Joan behaves like other old grannies, who went through the war and like to say "In my times..". Hayden is playfull, friendly ghost-kid who can talk with cats and wants to find some friends. Boss behaves collected, smart and calm.