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The BBC has released a first-look clip from this weekend\u2019s episode of Call the Midwife, exclusively for readers of RadioTimes.com<\/a>.<\/p>\n The final two episodes of season 11 are awaited with great anticipation by long-time viewers, as they are expected to usher in the \u201cbig\u201d plot development that will leave the residents of Nonnatus House shaken to their core.<\/p>\n The synopsis for episode 7 teases an \u201cunforeseen event\u201d in Poplar as the nunnery\u2019s \u201cbiggest threat\u201d to date, leaving residents and friends of the local institution in danger.<\/p> Alongside this dramatic plot, there will of course be more medical drama focused on newborn babies and their mothers, with this week\u2019s patient being teenager Carole Reece (played by newcomer Ellie-May Sheridan).<\/p>\n She is a familiar face to Sister Frances (Ella Bruccoleri), who delivered her baby weeks earlier and remains a pillar of support in this daunting new phase of her life.<\/p>\n Watch the exclusive Call the Midwife<\/a> clip below.<\/p>