There's an outbreak of measles and Tom receives an offer from the BBC. A face from Patsy's past returns and Sister Monica Joan goes missing.
The nuns prepare for Easter celebrations while Trixie begins a new exercise class. Patsy awaits Delia's decision and the group are shaken by the birth of a severely deformed baby.
Barbara in unsure on how to advise a young woman, Sister Evangelina's strong opinion leads to trouble, and Phyllis attends a Spanish class with unexpected results.
One of Patsy's clients is diagnosed with typhoid and Sister Winifred is deeply affected by the case of an unwed mother-to-be. Tom asks Barbara out to dinner.
Tom & Trixie work together to help a young couple, Barbara wrestles with her conscience, and Sister Julienne is seconded to a maternity hospital.
Phyllis becomes concerned about a new mother who is finding it difficult to cope, Fred must step in to help run the shop when Violet is injured, and Timothy makes Patrick have a realization.
A series of attacks on young women in Poplar has a direct impact on the residents of Nonnatus House, Trixie is suspicious about a patient whose pregnancy has not been reported. Patrick and Shelagh take a trip.
News of the forthcoming contraceptive pill is met with different reactions. Patsy tries to help a barge woman unused to life on land, and a storm hits.
Patrick is horrified to learn that a medication prescribed to expectant mothers may be the cause of the recent birth defects at Poplar. Tragedy strikes at Nonnatus House.
BAFTA TV Award Winner - Best Director: Fiction (Philippa Lowthorpe, 2013)
BAFTA TV Audience Award Nomination - Best Make-Up & Hair Design (2013)
BAFTA TV Award Nomination - Audience Award (TV, 2013)
BAFTA TV Award Nomination - Best Costume Design (2012)
BAFTA TV Award Nomination - Best Supporting Actress (Miranda Hart, 2012)
Christopher Award Winner - Television & Cable (2013)
Music & Sound Awards, Best Original Composition Award Winner - Television Score (2015)
National Television Award Nomination - Most Popular Drama (2014)
National Television Award Winner - Most Popular Female Drama Performance (Miranda Hart, 2013)
Prix Europa Award Nomination - Best Episode of a TV Fiction Series or Serial (2012)
Prix Europa Award Nomination - TV Fiction (2012)
Royal Television Society Award Nomination - Best Drama Series (2013)
Satellite Award Nomination - Best Actress in a Supporting Role in a Series, Miniseries, or Motion Picture Made for Television (Judy Parfitt, 2013)
Television and Radio Industries Club Award Winner - TV Drama Programme of the Year (2013)
Television and Radio Industries Club Award Winner - TV Drama Programme of the Year (2012)
TV Quick Award Winner - Best Actress (Miranda Hart, 2013)
TV Quick Award Nomination - Best Drama Series (2013)
TV Quick Award Winner - Best Actress (2012)
TV Quick Award Winner - Best New Drama (2012)