Sam is a twenty-something who never quite grew out of her tomboy phase. Rejected by her own mother, Sam is taken in by Miss Bea, her best friend's mother, who gives her a room in the basement and promises to protect her, even from her own lesbian ways. Following Miss Bea's unexpected death, a young couple buys the home. Their newborn son faces numerous health concerns, including a chronic and potentially fatal allergy to sunlight. Darius spends the greater portion of his young life confined to a basement playroom, while his disinterested parents lead their own lives, leaving Darius to create his own little world of adventure. Neither Derek, an up-and-coming author, nor Danielle, a housewife struggling to find peace with her husband's newfound notoriety and lengthy and somewhat furtive absences, seem to bat an eyelash at Darius' imaginative exploits with his friend, Sam, who lives in the basement.