Fantastic Voyage by Isaac Asimov was actually a re-read for me. But it has been many moons since I was in my hard-core science fiction phase (like 30 years or so) and so I couldn't resist adding this one to the list when I saw that it would fit into the Birth Year Challenge that I'm doing.
Asimov rarely disappoints--particularly when the material is all his--and has not done so here. Even though I can tell that this is not pure Asimov, it is still a very good story and a fun and exciting read. I gave it four stars when I read it before...three and a half now.