This story is a tale of a enhanced warrior caught in a time loop.
Jones writes great action scenes. His protagonist, Jack, appears to have memory losses each time his time loop occurs. This transfers into a bit of confusion in the story line.
The world of Jack's origin is grimly reduced to mere survival due to a nuclear holocaust of indeterminate origins. I deduce that Jack has been sent back in time to "fix" whatever needs fixed to prevent the destruction of Earth. I don't think this is a spoiler since it is just a deduction and I could be wrong.
Regardless of the minor confusion as to the exact direction of the story, Jack is being pursued by someone else from the future for some undetermined reason. The pursuit and ensuing vignettes provide the entertainment of the book.
I liked the book.
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This book may have been received free of charge from a publisher or a publicist. That will NEVER have a bearing on my recommendations.