Hot property Essiedu will play Catholic priest David oppositeKeeley Hawes, who is devoted nun Anna.
Both are deeply committed to their work in the church and in their community.
Neither are expected to fall in love.
Pictured: Anna (Keeley Hawes) and David (Paapa Essiedu)Channel 4
He unearthedFallingon a splashy slate earlier this yearfeaturingA Woman of Substanceremake and a Universal adaptation ofThe Rachel Incident.