Guest Stars Michelle Connolly as Lady Arabella Astleigh Barry John Kinsella as Brendan Kennedy Laoise Sweeney as Helena McGuigan Steven Calvert as Derek Michael Condron as DI Hollis Christopher Villiers as Lord Hugh Astleigh Ami Okumura Jones as Dr Naoko Yoshida Adrian Wheeler as Jeff Fisher Joe Barber as Dunstan Fisher Matthew Christmas as Francis Crozier
