Bryony Hannah - Cath

Cath is Jason's neighbour, who seems eager to avoid his invitations

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Call The Midwife fans should have no trouble recognising Bryony Hannah - she's starred as the show's nurse turned nun Sister Mary Cynthia since 2012. She was nominated for an Olivier Award for her performance in The Children's Hour and also starred in an episode of Life's Too Short.

Louiza Patikas - Amy East

Pathologist Amy is charged with helping to identify the victim - and discover what actually happened to him.

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Her face may not be familiar but her voice will be - Patikas has portrayed The Archers' own Helen Titchener for the past 16 years - and really hit the headlines after her character was involved in a domestic abuse storyline.

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