From the introduction page:
Magic and Mayhem
Get ready to experience one of the most challenging and exciting adventures ever designed for GURPS. The adventure unfolds to reveal dangerous villains, intricate plots, and magical conundrums – all with high action and a suspenseful climax:
Mordag's Little Finger: It's time to visit the Bad Side of Town. In this adventure, the party attempts to track down a clever master thief through the back alleys of the worst neighborhood in the city – Northside, where a meeting could get you choice information . . . or land you in the morgue.
Also includes Full stats and descriptions of several new creatures, further adventure seeds for each scenario, and much, much more . . .
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User summary: Fourth of four adventures from GURPS Fantasy Adventures, sold separately as PDFs. See also GURPS Fantasy Adventures: Fighters of the Purple Rage, GURPS Fantasy Adventures: Lost Inheritance, and GURPS Fantasy Adventures: Sahudese Fire Drill.