Rosie Cavaliero - Marion Kelsey

Paediatric nurse Marion Kelsey works on a teenage cancer ward and has been known to develop close bonds with her patients. She has a tense relationship with her sister, Elise, and her mum, Joy, and had a turbulent time when she left home as a teenager herself. Marion is married to Tony but he suspects that she hasn’t been entirely honest with him about her past and is concerned about her mental health.

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Rosie Cavaliero's face probably looks familiar because she's one of those actresses who has popped up in just about everything. From Mid Morning Matters with Alan Partridge to The Enfield Haunting, Cold Feet to Death in Paradise, she's got quite a few roles under her belt. Oh, and she's quite the acclaimed radio drama star too.

Nigel Lindsay - Tony Kelsey

Marion's husband Tony seems devoted to his other half, but often finds himself caught up in arguments between her and her sister.

If you're a fan of Four Lions chances are you'll know Lindsay as Muslim convert Barry, but he's actually quite the accomplished star of stage and screen. He took the role of Shrek in Shrek the Musical at the Theatre Royal Drury Lane. You may also have spotted him in You, Me and The Apocalypse, Death in Paradise, and the BBC's historical drama Rome. And he played Sir Robert Peel in ITV's Victoria too.

Holly Aird - Elise

There's no love lost between Holly and her sister Marion - but why?

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Cold cases are nothing new to Holly Aird who you might remember as Waking The Dead's original forensic pathologist Dr Frankie Wharton. She's had many minor roles in numerous TV series, but she's probably remembered by a generation for playing Nancy Thorpe/Garvey in Soldier Soldier.

Wendy Craig - Joy Dunphy

Marion's mother Wendy is celebrating her 80th birthday when we first meet her and it's hinted that all is not right between mother and daughter.

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Beloved sitcom veteran Wendy Craig appeared in numerous films throughout her career but is best known for her appearances in the sitcoms Not in Front of the Children, Butterflies, And Mother Makes Three and And Mother Makes Five. She also played the role of Matron in ITV's Heartbeat spin-off The Royal

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