A New Life Awaits!ArrowHeart Mansion has been vacant for at least a decade. Well, it's not exactly been unoccupied...With the arrival of a new family that includes Angelique, a lonely, crippled child, the atmosphere changes straight away. Angel, as she is called, finds refuge in the attic rooms of the mansion. An accident occurs and, by this coincidence, the child stumbles upon the existence of others living in the attic. She crosses an invisible boundary and steps into another world where she makes new and everlasting friendships. Because of them, Angel's life changes forever.Enthusiastically joining her new-found friends in daring escapades, Angel helps solve crimes via dimly lit avenues located underground. Hidden beings watch Angel and her troop until one day, sliding stone doors are opened, beckoning them to step inside. There, they are deliberately swept into the secret world of the Underground Dwellers.Along the way, Angel is specially chosen by the council of extraordinary creatures. She's needed to help the castaway dwellers below ground. The outcome for Angel is a bonding of friendship with a wise and powerful mutant leader and a life-long commitment to the Underground Dwellers.