Without reading "The Mark of Nerath", this book makes a lot less sense. Everything in this book was established in "Mark of Nerath", except the titula..Show More »r Temple of Yellow Skulls.
Ignoring that, it's a decent adventure (if those elements were actually removed so it could stand alone, it would be an excellent adventure) and it is easily better than the next book in the series. I just can't escape how much it refers to the previous book. It fills in all the details, the characters spend a lot of the adventure talking about the events of the last adventure, which isn't marked as part of the series, or available on Audible.
Honestly, I'd skip this one unless you've read "Mark of Nerath". If you have read "Mark of Nerath", you probably won't need me to tell you that you ought to skip this book. If for some reason you read this first, it completely and utterly spoils "Mark of Nerath" as they rehash, in detail, all the major plot points.
Also, the second book has a different author. I blame this for ruining the second book (Oath of Vigilance", and I feel it's worth knowing about before you potentially become invested in the series.