Meet the cast of BBC1 thriller Trust Me

Cara Kelly as Mona McBride

Who does she play? The upstairs neighbour in Cath/Alison's new Edinburgh flat. She is old-fashioned, raising an eyebrow at the fact "Ally" is a single parent, but nevertheless is keen to welcome mother and daughter, and offer her babysitting services. A friendly face in Cath's scary new world, she is used to taking care of the new doctors that move into the flat below and is on hand for tea, biscuits and reassurance.

Where have I seen her before? Kelly has starred in a variety of TV shows including Waterloo Road, Shetland and Rillington Place. She also has had an illustrious career on stage, including playing the title role in National Theatre of Scotland's Elizabeth Gordon Quinn and working for the Royal Court, Royal Shakespeare Company and the Almeida.

Lois Chimimba as Karen

Who does she play? A nurse at the Edinburgh hospital, she has the know-how and boldness of Cath in her former life, unafraid to say what she thinks and keen to keep the doctors on their toes. She takes to "Ally" for her lack of arrogance and encourages Andrew to be honest about his feelings for her – little does she know that the reason why the new doctor seems like one of the nurses is because she is one of them.

Where have I seen her before? She starred in The National Theatre Live: Peter Pan, as well playing Beth Forbes in Holby City, and making an appearance in the BBC Comedy Feeds.

Michael Abubakar as Charlie McKee

Who does he play? A younger doctor in Edinburgh, Charlie is methodical and can seem uptight at work, with Karen calling him "OCD", but is jokey and sweet in his downtime. Like Andrew and Brigitte, he is nothing but friendly to "Alison", keen to welcome her into the team both professionally and socially.

Where have I seen him before? Again, you may not have seen him before. He was praised for his performance in Invisible Army, a play about young carers on the Edinburgh Fringe, and is just starting out in his acting career.