The Prisoner is part of a biography of Paul Darrow, but I will only be talking about this story.

The Prisoner is an interesting piece. It comes across as a meta story about the nature of Iago's place in the larger Kaldor City narrative. It almost explicitly states that this is fiction, and Iago is the audience surrogate, helping to move the plot forward.

While I don't think the premise hits in the way they hoped it would, it is interesting, and is worth a listen. It isn't necessary as part of Kaldor City, but it is an interesting side piece.