Tiassa, Brust's thirteenth novel, is one of the most ambitious to date. It incorporates a myriad of writing styles from his past Dragaera works; the typical Vlad first-person, the third-person character-per-chapter narrative used in Brokedown Palace, and as much of the book focuses on Khaavren and his family, a bit more of Paarfi. This book is by no means a stylistic exercise, however; it has a focal point that stays very focused on the plot, and the way the story is presented actually gives a new way of looking at things. It was especially interesting to see, during the course of an investigation, the way Khaavren and a number of those in his employ measured Vlad's worth with a sense of begrudging respect, or the way Norathar and Cawti feel towards one another/the Empire, how idiotic Piro's 'benevolent highwayman' schtick appears in Vlad's world, etc.
I've seen other reviewers claim that this book does nothing to further the story, a criticism I honestly would've lodged against Iorich, which, while a decent read, did little to advance the overall plot or provide opportunity for character growth. Tiassa not only sheds some light on some things that have been alluded to in past books (Devera, the Issola bard, the box he talks to) but also drops some HUGE hints toward the future of the series, one in particular stated almost outright by a certain Imperial official.
If I have to levy a criticism against it, it would be that it is definitely not the best place to jump into the series (though arguably that has been true for several books at this point) and it does heavily incorporate characters (and the ridiculously, hilariously overwrought writing style) of the Khaavren romances, which I adore, but could be confusing even to long-time readers if they've never strayed outside of the main Vlad series. Chronologically, it's all over the place; it jumps from events happening just after Yendi to around the same time as Dragon to slightly before (or after) Iorich.
Its a great book for long-time fans of Brust, and definitely one of the best in the series, both in terms of story and general writing. Not to be missed.