Every fortnight, Alice and Dean meet their divorced dad Stewart for Saturday lunch. With Stewart it's always voucher deals. Forget dining at the twilight hour - Stewart only eats at the discount hour. But one day, Stewart forgets his wallet and they run off without paying. It's an adventure. It brings them closer. And so begins a spree across Brighton's restaurants as the family become serial "dine and dashers".

But there was one thing they hadn't counted on. Waitress Rebecca has one of their skipped bills taken out of her wages. Struggling to pay for food for her son, she vows to track down the perpetrators. Because after all, there's no such thing as a free lunch.