This omnibus collects the final three volumes (out of seven) of Fritz Leiber's Fafhrd and the Gray Mouser tales, respectively one novel (The Swords of Lankhmar)and two short story collections (Swords and Ice Magic and The Knight and Knave of Swords).
The first of the three volumes, the novel, was really entertaining and up to the quality of earlier Fafhrd and Mouser stories. It had its really weird moments, though. At one point, when the protagonists are sailing the sea, they encounter (of all things) a German guy from another world riding a seadragon. Luckily, this person has a German - Lankhmarese translation dictionary with him and our heroes soon learn that the guy comes from a world called Tomorrow, where he works in a museum that displays mythical creatures. His job is to travel the worlds catching these beasts and now he's looking for a Scylla, a sea monster first encounter in the writings of an ancient fantasy writer called Homer. I kid you not.
The two short story collections are more uneven, with most stories uneventful and boring. People say Leiber's later stories really showed a decrease in quality, with an increased emphasis on sex and weirdness. I agree to a certain point, but my main complaint was that the later stories just weren't so interesting anymore.
Overall though, the Fafhrd and the Gray Mouser tales are really entertaining (especially the early ones) and classics of the sword & sorcery genre. If you like s & s tales, filled with humour and written in lofty, alliterative prose, be sure to check them out. I would recommend you read them in chronological order, though, as there are often references to earlier events. It is also interesting to recognize the influence these stories have had on more recent fantasy writers. For example, Terry Pratchett's humourous writing style (especially in his earliest Discworld novels) clearly shows Leiber's influence. Feist also comes to mind, whose academy of magic in his Midkemia books, Stardock, is named after a mountain in Newhon (Fafhrd and the Gray Mouser's world).