Ever since his firefighter father died on 9/11 when Scott (Pete Davidson) was seven, he's felt like he has a case of arrested development. Although his younger sister (Maude Apatow) is heading to college, Scott, now in his mid-20s, spends his days smoking weed, hanging with the guys and hooking up with his childhood friend (Bel Powley).

But when his mother (Marisa Tomei) starts dating a loudmouth firefighter (Bill Burr), it sets off a chain of events that will force Scott to grapple with his grief and take his first tentative steps toward moving forward in life.