Tiassa is the thirteenth book in Steven Brust's Vlad Taltos series, set in the fantasy world of Dragaera.

The first section, "Tag", tells the story, in the typical Vlad Taltos as first person narrator style, of certain events early in his career as a high-ranking Jhereg.

Vlad is contacted by the Viscount of Adrilhanka, who is a rogue and highwayman, to defeat a scheme by the Empire to track stolen money.

The second section, "Whitecrest", is set much later, after Vlad is on the run from the Jhereg, and follows multiple characters, mainly the Countess of Whitecrest (Khaavren's wife and the Viscount's mother) and Cawti, Vlad's ex-wife.

The third section, "Special Tasks" is the most recent chronologically, and is written in the voice of Paarfi, the fictional author of the Khaavren Romances.