Guest Stars Elijah O'Sullivan as Jacob Dwyer Conor Mullen as Frank Ahern Carrie Crowley as Mairead Noonan Justine Mitchell as Elaine Lynch Éanna Hardwicke as Joe Ryan James O'Donoghue as Calum Dwyer Hazel Doupe as Ingrid Jensen Ayoola Smart as Cathy Cregan Hugh O'Conor as Dr. Kevin Lochlainn O'Mearáin as Rory Dwyer Stuart Graham as Denis Ahern Thomas Levin as Carl Jensen Michael Patric as Sgt. Paudie Manning Carmel Stephens as Dr Helen Fahey