Why Did We Eat the Frogs

Diane decides to make her connection to Oliver temporarily permanent and the couple exchanges "vows" on sacred ground. They begin their "honeymoon" at an inn with a proprietress who is delighted to play along. Next day at Hadrian's Wall, their union is blessed with the surprise appearance of a son. They plot their next move when Oliver discovers that Aristotle is giving them clues to the mystery in the crosswords.