This is the continuation of Merlin's story in the Amber saga ... book two of the five you will read to finish the tale of his adventures.
In the first book, Merlin survived multiple attempts on his life, and book two is no different. However, by this time Merlin is starting to get a handle on who some of the parties behind those attempts may be, and at least one of them is quite a surprise.
In this book, as in many, Zelazny shows a genius for making the mundane sound interesting. If he wants to give you the feel of a long and thought filled journey, he GIVES you a lengthy description of the long and though filled journey. The journey takes time for you as well as Merlin. Zelazny fills the description with tidbits of what fills Merlin's senses. He describes details both mundane and extraordinary and makes it all interesting to the reader. That's no easy task for a writer to accomplish, but it seems effortless for Zelazny.
The details of where this part of Merlin's story begins and ends is absolutely irrelevant, because you aren't going to be picking out this book apart from the rest of the series to read by itself. You MUST read all five books to get the complete story. None of the five stands on its own, and the first four generally end either on a cliffhanger or a startling revelation. So I'm not going to provide any more detail of the storyline than I've already hinted at.
After you read "The Trumps of Doom", just continue right along with this one and enjoy. Make sure you have all five books in the series at hand, because you won't want to wait even a minute from the end of one to the first chapter of the next. I feel for the people who had to wait two years to continue their read as these books were published. Actually, that group includes me for the five books of Merlin's story. I read the first five books encompassing Corwin's tale all at once, but finished them just about the time "The Trumps of Doom" was published. Luckily I read these books so long ago that I only remember the details of the plot as I read and am reminded, so it's pretty close to a new read for me. I'm lucky that my memory was not sufficient to recall any more than it did of these books! LOL