 Calum returns from Ireland and is thrilled to hear that Deirdre will be spending a week in Darrowby; unfortunately, the week doesn t quite go as planned. Siegfried treats a horse after it suffers a serious fall and James is introduced to a family of cat lovers. Tristan meanwhile treats a dog who seems to take great joy in biting him. He subsequently learns that he must go to Ireland for the next month to continue the tuberculin testing.