Chet is a father and husband who believes in spending quality time with his loved ones. When vacation roles around, he gathers his gang together and they head for the hills. But as soon as the crew gets comfortable in their cabin, Chet's annoyingly bad-mannered brother-in-law Roman shows up with his spoiled wife and kids for a week-long visit. To make matters worse, Roman brings more than his family -- he brings Murphy's Law with him, as he turns the week into a succession of disasters.