James I: The Key Will Keep the Lock. This is an history play in the great tradition of political history plays going back to Shakespeare and others in the Early Modern period--I mean by this that James I becomes a meditation on power, law, justice, and the responsibilities of a monarch, without being limited to that meditative element. James begins the play as a prisoner of Henry V of England (who is much less admirable here than Shakespeare presents him) and his cousin Duke Murdoc Stewart sits as regent of Scotland. When James in released and returned to Scotland he encounters all kinds of problems, and he must transform himself from the prisoner unable to out wrestle the dying Henry into a king strong enough to lead a hostile Scottish nobility, including Murdoc's sons who plot to overthrow their cousin.
James II: Day of the Innocents. This is definitely a much more challenging play to read, and I would imagine to stage, than its predecessor. While James I is largely a political play, much of James II is a dream play moving very quickly between the world of dream and reality--the nightmares of the young King James II blend seamlessly with the very dangerous political reality in which he finds himself. There are repetitions, but these are the easiest of the dream elements to stage in my mind. Things like black snakes flowing from the king's veins, and the rapid set changes between hell scenes, the blood spattered court, and James' bedroom seem much more difficult to me. I'd love to see the show performed and see how these effects were achieved.
James III: The True Mirror. The figure of James II reminds me a lot of Marlowe's Edward II, except reworked for a contemporary audience with more focus on Margaret (Isabella is a relatively minor character in the Marlowe, who is quickly surpassed by Mortimer) as a strong female ruler, a democratic thread, and even a plug for Scottish independence (of course, the plays debuted in 2014, a year with a referendum for Scottish independence). James is oddly democratic in his inefficiency and refusal to rule, rejecting the authority of aristocratic tradition and heritage as a right to rule or find favor with the monarch. However, his general indifference to the condition of Scotland exposes James' hypocrisy, especially his willingness to allow an English conquest. It is Margaret (the real protagonist of the play, despite James being the titular character) who actually struggles and stands up for Scotland's benefit. Near the end of the play she makes a stirring speech uniting the Scots under her rule (carried out in James' name), and she becomes the temporary savior of Scotland.