Rating: 
Summary: Good time travel
Review: The ultimate in Mulligans. If you could do-over something, what would it be? Hogan's main character builds a machine that can send information to itself in the past. The new information's arrival in the past influences and changes the future that sent it. Good reading and shows how small events can trigger major changes for the character's lives
Rating: 
Summary: Boring characters and slow as molasses story line.
Review: This book barely gets off the ground. The characters are cardboard and interact very very slowly. The author spends many pages on their interactions, which grind the reader's interest down until you can barely care what happens or whether there will be a bar fight or if the cat is going to somehow disrupt the time machine.... The time travel aspect of this book is cloaked in scientific jargon intended to make you believe that sending messages through time is plausible and that the characters are scientific in their manners. Yawn! Does the author want to be taken seriously as a sceintific science fiction writer? Well, he never really describes the nuts and bolts of the time travel apparatus.... just gives lots of gobbledygook about physics 101. The result is that you care less and less about the science-speak aspects of the book. So, the characters are boring and the science talk is a yawn. How about the story? It might have been OK, but why bother to stick around and find out, when you have to wade through this interiminable bore of a book?
Rating: 
Summary: Great Potential
Review: This book starts with a lot of potential, but unfortnately the author gets bogged down in ad infinitum descriptions and details of the "science and theory" of his device that is the heart of the story, and the real story gets lost. I thought this book was written in 2000, but it was actually first copyrighted in 1980, so the science is somewhat outdated. His later books are better, such as The Legend That Was Earth.
Rating:
Summary: Great Potential
Review: This book starts with a lot of potential, but unfortnately the author gets bogged down in ad infinitum descriptions and details of the "science and theory" of his device that is the heart of the story, and the real story gets lost. I thought this book was written in 2000, but it was actually first copyrighted in 1980, so the science is somewhat outdated. His later books are better, such as The Legend That Was Earth.
Rating: 
Summary: Makes a wild idea plausible
Review: Thrice Upon a Time is my first Hogan book, but I have followed up by ordering more. Time travel is a favorite topic of mine. I've read so many I've lost count. This one stands out in that it is very heavy on science and theory. If you like to ponder the possibilities and ramifications of communication across time, this book will appeal to you as it did to me. It has an excellent treatment of the paradox dilemma. One guage I use to measure a time travel novel is believability...Hogan has managed to be creative while at the same time presenting a plausible scenario. The consequences of altering the future are explored in a satisfying (and believable) manner. Those reviewers who found the book dull are not people who have spent a great deal of time pondering the theories. The book involves the reader in trying to figure out the theory, because once the ability to send communication back in time is discovered, the next step is figuring out how it's done and how the paradox situations fit into the equation. The true nature of time is explored thoroughly. It is not a book of rip-roaring action, but definitely a book for those who are enthralled by the idea of communication through time. I found it immensely satisfying.
Rating:
Summary: Makes a wild idea plausible
Review: Thrice Upon a Time is my first Hogan book, but I have followed up by ordering more. Time travel is a favorite topic of mine. I've read so many I've lost count. This one stands out in that it is very heavy on science and theory. If you like to ponder the possibilities and ramifications of communication across time, this book will appeal to you as it did to me. It has an excellent treatment of the paradox dilemma. One guage I use to measure a time travel novel is believability...Hogan has managed to be creative while at the same time presenting a plausible scenario. The consequences of altering the future are explored in a satisfying (and believable) manner. Those reviewers who found the book dull are not people who have spent a great deal of time pondering the theories. The book involves the reader in trying to figure out the theory, because once the ability to send communication back in time is discovered, the next step is figuring out how it's done and how the paradox situations fit into the equation. The true nature of time is explored thoroughly. It is not a book of rip-roaring action, but definitely a book for those who are enthralled by the idea of communication through time. I found it immensely satisfying.
Rating:
Summary: Imagination Bender
Review: Thrice Upon a Time is not a book to read if you're not ready to be totally absorbed. The author allows the reader to imagine the consequences of altering the entire universe by changing one small event in the past. The reader will quickly become lost in the story-line as well as the characters. This book is excellent if you're prepared to do some thinking. I highly recommend it.
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