The Feltons are a family with a long lineage stretching back beyond the Norman Conquest. They now have a daughter, Ianthe, but prior to her birth Tobias, or Toby, was fostered and then adopted as their heir after he had miraculously survived the sinking of a refugee ship by a German U-Boat. Then, someone who is clearly Toby's twin turns up as an under-gardener. He had been fostered by a Scottish couple, now dead. There is now general and disturbed...