Michael Marshall Smith's Spares is a great piece of speculative fiction. Hardboiled, noir, cyber-punk, urban, street & high tech; it checks all the boxes. The newly discovered and mysterious inter-dimensional universe, called "The Gap", is an interesting combination of the oppressive psychological state that impregnates all of J. G. Ballard's "disaster trilogy" and the drug induced alternate reality of Jeff Noon's Vurt. An interesting construct. Worthy.