Robin Laws' Mutant City Blues may not be the best selling Gumshoe game, but it's not for lack of quality. And Hard Helix proves it's a damned shame.
Four excellent adventures are included including the "title track," which is a great introduction to the setting presented in the core book.
I recommend Hard Helix for all Gumshoe aficionados, however, because these scenarios can double as the ultimate guidebook on how to build a Gumshoe scenario as the designer originally intended.
[5 of 5 Stars!]