Call The Midwife screenwriter Heidi Thomas has told how she keeps the show's scripts hidden away from her husband - despite the fact that he stars in the drama.
Stephen McGann plays widowed GP Dr Turner in the TV hit, alongside the likes of Jessica Raine, Miranda Hart and Jenny Agutter.
The period drama means that the couple, who met after Stephen starred in one of Heidi's first plays at the Liverpool Playhouse, are working together for the first time in 25 years.
But Heidi, whose credits include the TV adaptation of Cranford and the recent series of Upstairs Downstairs, told the Radio Times that Stephen - the brother of fellow actors Paul, Mark and Joe - did not get to see her scripts before the rest of the cast.
"If he comes into my study while I'm working on them, I cover the screen," she told the magazine.
"But it's wonderful having a project that you can mull over with your partner, although I think our son gets fed up with it."
The opening episode of the second series of the drama, based on the late Jennifer Worth's memoirs and set in London's East End, was watched by 9.3 million viewers.
Heidi said that exhausting all of Jennifer's stories would prove no barrier to the continuation of the show.
"I will have done (finished her stories) by the end of the second series," she said. "But don't worry. It doesn't mean the show will end.
"The characters will be well developed by then and Jennifer was happy for us to continue."