Various British TV shows have left a mark in American audiences; especially period dramas like Downton Abbey and Mr. Selfridge have become particularly popular. Other shows like Sherlock have a tremendous cult following around the world. Yet, another British show that airs on PBS has begun gaining the same popularity it has in the U.K.

Set in the East End of London, Call the Midwife tells the story of midwives in the late 1950s. The show is based on the memoirs of Jennifer Worth and has gained a wide appeal in the U.K. The show's third season has just ended in the Britain and will air tonight in PBS at 8 p.m.

According to the Daily Mail, the success of Call the Midwife has been unprecedented, with the season finale gathering an estimated 8.8 million viewers. The show has been renewed for a fourth season, which will air sometime next year. One of the show's centerpieces is Miranda Hart's character Chummy, whose character has developed from comedic relief to the story of a woman struggling to adjust to motherhood.

Miranda Hart has reflected on Chummy's character. Chummy, having been born into a wealthy aristocratic family who was horrified at the idea of her becoming a midwife, struggles to adjust and Hart shows it splendidly, according to the Huffington Post.

"She carries her background and her lack of love from her mom," said Hart in an interview for HuffPost TV. "She had such an upperclass upbringing -- she probably went to boarding school at seven. She carries that vulnerability and insecurity around with her."

While the other nurses lives entail finding love and dealing with the surprises and uncertainties of childbirth, Chummy struggles to find a balance between motherhood and home life. Huffington Post praises the show for its depiction of both the midwives' lives and that of the local residents they help.