When a surprise birthday party for his recently divorced best friend runs low on alcohol, a married thirty-something reaches out to his neighbor's son, a straight-laced, high school valedictorian, to be their designated driver for a trip to the liquor store. In the process, a simple, twenty-minute journey unravels into a twelve-hour chaotic adventure when the kid goes missing, leaving the two men scrambling to find him and get him back in time for his graduation.