The Uninvited Guest - S4.E26

A girl is thrown from her horse and knocked unconscious trying to cross a river in which Alan Finlay is fishing. When she comes round her memory is gone. The partners decide that she must stay at Arden House while she recovers from her injuries and amnesia. Both men, Finlay in particular, are attracted to her, but Janet does not share their admiration for their uninvited guest.