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:
Lost Inheritance: A magical trip into the Darkland -- a place of strange creatures and untold dangers. Will the PCs find the inheritance and collect the reward? Or will they fall to darkhounds or the obsessed apprentice mage?
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: Second of four adventures from GURPS Fantasy Adventures, sold separately as PDFs. See also GURPS Fantasy Adventures: Fighters of the Purple Rage, GURPS Fantasy Adventures: Sahudese Fire Drill, and GURPS Fantasy Adventures: Mordag's Little Finger.