I was originally going to write that this was really two stories: a pretty well-done noir PI story with bars and toughs and murders and doomed love and stuff, and a pretty well-done dystopian SF story with intelligent kangaroos and sheep and state-supplied designer drugs and a taboo against asking questions and considerable other novel stuff.
But thinking about it now, it's actually better than that. The drug (addictive and seductive) that selectively erases memories is a key part of the PI plot, an important feature of the SF setting, and a strong metaphor for things linking them. The intelligent sheep figures in the PI yarn, the SF story, and again throws light into something about life and dependency and subservience and betrayal.
So this isn't just a good story and a good SF setting duct-taped together Cowboys In Space style; it's a good unified story about particular people (and kangaroos and sheep) in a particular place, and it all works together pretty well.
You should read it.

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