This is an adventure that could have been ripped from the pages of Conan the Barbarian... it has caught the very essence of such tales well.
It has it all - a mad necromancer, an ancient crypt, a strange and almost mythical monster, untold riches there for the taking - and is set notionally in Hyperborea, although notes are provided to enable you to transplant it to another setting if preferred.
The adventure begins with some clues that the characters can discover or be given to point them in the right direction, all bound up in a teeming city that Conan himself would have felt at home in - at least, when he was in the money. Then it's off across a barren wasteland (of course) in search of the Sightless Serpent and the crypt wherein it apparently makes its home. A crypt replete with sarcophagi, mummies, traps and all the usual appurtenances to make for an exciting dungeon crawl, naturally.
It's as near as the characters will get to adventuring like Conan, a fine adventure in appropriate style.