I love Sci-fi. Must be the only genre I like. Except.. beside Frank Herbert, I never found some good sci-fi. Asimov is good, but with stupid character sometime. And most of the other, from Dan Simmons to C. Clark , F. Leiber (the one who wrote the same story twice, in 2 trilogy) , Jack Vance, Van vogt (at least, this one is funny for his personal heel face turn ), they all lack constructed clever story.. and as I said, I dont like sci-fi close in the future, like all the cyberpunk sub-genre. Ok Zelazny, get a pass. He is funny with real original setting. Herbert> Zelazny> Asimov > Every one else > K.Dick So thanks for the recommendation. I'll read the summary .... Ok I just read it on wiki Now, I remember!! I read that Book. I should have remember It has the same title in french. I loved the premise. and was disappointed by the solution. On the grip hand, at the time I read it (if I remember well, I took it in my small local library under the Sacré Coeur.. or my modern library in Strasbourg... or I should check in my bookcase if I bought it)... anyway , at that time, I had no idea of the Fermi paradox. But imho, it is still a lackluster resolution, so I never read anything else from the guy. That's the problem: when I love the basic mystery, the author better deliver on the resolution, or I get real pissed. Maybe the 2 others tome are better. Guess I'll never know