Nineteen-year-old Nick Wattley is serving as the best man in his father Tim's wedding to his partner, Craig Pearson. After being closeted for years, Tim is finally out and proud and Nick is happy for his dad.

But a weekend that's supposed to be filled with pre-wedding preparations turns into a nightmare for Nick as he's forced to deal with one uncomfortable situation after another. A day after witnessing a terrible argument between Tim and Craig, Nick mistakenly walks in on his father and his partner while they're in flagrante delicto . Just when he thinks things can't get any worse, Nick has to deal with Tim's anxiety over walking down the aisle again and fend off an old friend of Craig's who tries to make trouble.

Can Nick keep his cool long enough to get his dad to the altar?