By Paul Holmes. How many of these books did Holmes write?, you might be asking. (Two and a half, although it kind of seems like more.) This is a 1966 PB of the follow-up, featuring, as the first book did, "on-the-scene sketches" of the trial action.
The book looks its age: edgewear, a slight twist to the spine, and what looks like water damage to some pages (there's also a library/store stamp, I think, on the top page edges). But this one's a bit harder to find, and the one in stock is perfectly readable.