4.09 avg rating — 513,415 ratings

4.21 avg rating — 379,601 ratings

"It is a collection of short stories, all revolving around Asimov's three laws of robotics. The stories are brilliant and flawless and the writing straightforward and entertaining.
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4.12 avg rating — 184,394 ratings

"Written like a narrative, but captivating. The story has a novelty. Even though there are several other sci-fi related to extraterrestrial intelligence this one stands apart because of the originality of the story and the detailing of Rama. Product of a brilliant mind, I should say."

3.94 avg rating — 8,652 ratings

"Marker is more of a science fact than science fiction. Incidents resembling those in this novel might be going on around us and we might not be realizing it. This prospect is scary. The novel is worth a read because of it's plot which is very much relevant in today's world."