The Replacement is a three-part psychological thriller set in Glasgow, which follows the paranoia of a woman who sees her identity being dismantled and can’t work out whether the cause is another woman or her own baby.When Ellen, a successful architect in her mid-thirties, falls pregnant, she finds maternity cover in Paula: brilliant, enthusiastic and raring to go. Ellen wants to champion her, but something’s not right. Ellen begins to fear for her safety when she suspects her maternity cover has a disturbing agenda.