The twelfth series of the British medical drama television series Holby City commenced airing in the United Kingdom on BBC One on 20 October 2009. The series deals with the repercussions of the death of ward sister Faye Byrne's son Archie, including the resignation of consultant Connie Beauchamp and the return of former registrar Thandie Abebe-Griffin. It also focuses on staff members' romantic and family lives. F1 Oliver Valentine becomes romantically involved with registrar Jac Naylor and ward sister Daisha Anderson, and his sister Penny embarks on a secret romance with a heart transplant patient. Consultant Linden Cullen is reunited with his estranged daughter Holly, nurse Donna Jackson decides to adopt her half-niece Mia, sister Chrissie Williams gives birth to a son, Daniel, and Faye