When Call the Midwife returns this Sunday to PBS for series 14, the midwives enter the 1970s, which brings with it new challenges for Nonnatus House.

For those remaining few on Planet Earth that may be wondering just what is this series that is entering its 14th season, Call the Midwife is based on the best-selling memoirs of the late Jennifer Worth who worked with the Community of St. John the Divine, an Anglican religious order, at their convent in the East End in London.

The series brilliantly tells colorful stories of midwifery and families in London’s East End by following the nurses, midwives and nuns from Nonnatus House, who visit the expectant mothers of Poplar, providing the poorest women with the best possible care.

Series one was set in 1957 with each successive seasons tracking with the events of the following year leading up to this Sunday’s 14th season premiere set in 1970. When we last left the ladies of Nonnatus House, it was Christmas 1969 and there was concern about the Hong Kong flu epidemic while a meeting between Sister Julienne and the head of the Board of Health suggests a risk to the future of Nonnatus House.

It’s now 1970 and chaos erupts as Isle of Dogs activists bid for independence. Amid the turmoil, the midwives work tirelessly to keep Nonnatus House running while addressing complex social and health challenges. On the lighter side of 1970, Poplar and the world are being introduced to percolators, vending machines and the widening of flares, oh my!

Never one to shy away from the events of the day, Call the Midwife has continued to tackle topical subjects and contemporary social, cultural and economic issues, including nationalized healthcare, infertility, teen pregnancy, adoption, the importance of local community, miscarriage and stillbirths, abortion and unwanted pregnancies, birth defects, poverty, common illnesses, epidemic disease, prostitution, incest, religion and faith, racism and prejudice and same sex attraction. Series 14 is no different.

While much of the cast has changed over the years, long-time audiences have had the comfort of watching as Jenny Agutter (Sister Julienne), Judy Parfitt (Sister Monica Joan), Helen George (Nurse “Trixie” Franklin), Cliff Parisi (Fred Buckle), Laura Main (Shelagh Turner) and Stephen McGann (Dr. Patrick Turner) have, thankfully, remained constant from that first fateful day Jessica Raine (Nursing Sister Jenny Lee) knocked on the door of Nonnatus House.

Call the Midwife, season 14, premieres Sunday, March 30 at 8:00pET/7:00pCT on PBS!