You're welcome! Michel Gondry kept toying with us all about an "Ubik" movie, and I'm sure it would have been fantastic, but now you have no choice but to read the book. Luckily, it's a very good book. One last word of advice; don't watch "Stalker" thinking that it will be like "Roadside Picnic". It is based on the book, but it's nothing like it. I wouldn't even consider the movie to be sci-fi at all, not that it isn't an intriguing movie if you like great cinematography and philosophy. :)