Dr Lucinda Edwards (Niamh Algar) is a smart, battle-hardened doctor, but we meet her on a nightmare shift that ends in the death of an opioid overdose victim, Edith Owusu. Despite the support of her medical supervisor, Dr Leo Harris, played by James Purefoy, Ediths grieving father Sir Anthony Owusu, played by Brian Bovell , demands an enquiry into Lucindas actions on the fateful night.