Struggling to cope with tragic loss, Denis Murphy has, for the past seven years, learned to live differently. His friends are used to his strict routines, like ironing his socks and lighting his fireplace every Sunday (even in the summer). His forlorn mother puts up with his strange "no touching" antics, even though all she wants is a hug from her son. Really, the only problem is the four monsters he has for roommates. This ragtag bunch run his life, determined to create chaos in his orderly world. Then Rebecca, Denis's enigmatic ex-girlfriend from his former life, returns to town. Shocked to meet the new Denis - a broken man, unable to manage even the most basic social interactions - she becomes fixated on bringing back the funny, charismatic man she once loved. As Denis begins to emerge from his sheltered existence and rediscover the person he used to be, the monsters declare all-out war. Denis is finally forced to confront the demons that share his house, and his head.