1933. Hercule Poirot, older and greyer, receives letters threatening murder. The sender signs themselves only as “A.B.C.” When he takes the letters to the police looking for help, Hercule finds all his old friends have moved on. But soon there is a murder and the once-great detective must take matters into his own hands.

Drama series about the staff and patients at Holby City Hospital's emergency department, charting the ups and downs in their personal and professional lives.