Masques is a throwback to the kind of sword and sorcery fantasy I was reading in late high school. It has all of the cliches that Diana Wynne Jones mocks in Tough Guide to Fantasyland: the generic medieval setting, the cross-dressing heroine, the Lost Heir, the eeeeeevil darklord. It has been at least a decade since I've read fantasy this pulpy, and I discovered by page 50 that I would be 100% okay with never reading this stuff again.
That's not entirely this book's fault, but Masques is also just not a very good book. I got to page 107 before DNF-ing, and remarkably little had happened in that time. (Heroine escapes dark lord, falls in with the rebels, dark lord starts murdering people.) Instead, there were pages of cringe-y banter between our intrepid heroes who are falling for each other (if you missed this, the omniscient narration helpfully offers the same scenes from both perspective so you know how they feel about each other). Lots of time spent with our heroes reading books, which I don't really mind, but doesn't make for the most electric reading experience. Clever little side stories that also do not provide any kind of momentum. Finally, around page 100, two people turn up dead, and I was all 'hurrah for something happening!' before it turned into more flirting between our protagonists.
There's some promise here, and the writing is usually not terrible enough for me to pay attention to its deficits (other than the supreme awkwardness of the banter). I have not read much of Patricia Briggs's later work, but based on her popularity, I have to assume she's improved as an author.
Some books should stay out of print. This is one of them.