I believe the key to solving this puzzle is to arrange the panels as follows:
1. The Knight and the Queen are together.
2. The King sees the Queen with the Knight.
3. The Queen is kidnapped.
4. The Knight and the King have an affair.
This arrangement should fulfill the conditions of the puzzle: the Knight and the Queen are together, the King witnesses it, the Queen gets kidnapped, and there's an affair between the Knight and the King.
Sure, here are the key facts extracted from the provided text:
1. Edgar murders his wife.
2. Seances are mentioned.
3. Poison is involved in a marriage proposal.
4. There's a complicated family tree involving fathers, uncles, and brothers.
5. The Duke and Duchess have a romantic connection.
6. The King witnesses something involving the Knight and Queen.
7. The Knight and Queen are involved in an affair.
Please note that these facts are based on the information provided in the text, and some of them might be part of a fictional or creative narrative.