Jon Heder, Diane Keaton and Anna Faris star in Tim Hamilton's comedy about eccentric Jeffrey Mannus, a 29 year old who still lives at home with his mom, Jan. He has no desire to leave but his perfect world is upended when Jan meets Mert, a motivational speaker who quickly woos her and moves in on Jeffrey's territory, much to Jeffrey's dislike. To try and move Mert out Jeffrey enlists the help of an unlikely ally, an aspiring singer-songwriter, Nora, with an anti-establishment penchant and a soft spot for him. As the war between Mert and Jeffrey escalates, something unprecedented happens - slowly, to both his own surprise and horror, Jeffrey discovers his inner adult.