Penny has big dreams for her wedding day. She wants an unforgettable celebration, perfect down to the last detail, and has been saving for ages to make her dream a reality. When Mark finally pops the question, it's the best moment of her life. Until Penny checks her wedding fund and is horrified to discover that something has gone terribly wrong. There's far less money there than she'd thought... and it's all her fault. She can't tell Mark the truth about what she's done, he knows nothing about how much time she spends gambling online. Her only choice is to seek help for her addiction and get married on a drastically smaller budget. Working under the pretense of surprising Mark with her plans on their big day, operation 'Don't Tell the Groom' rolls into action, with surprising, hilarious and often moving results.