At the Narrow Passage by Richard Meredith, Sci Fi. Book is in good condition, all pages intact.
A warning of pending doom is sent back from the future, but the message is not intended for us. Rather, it was sent to the reptillian Krith who inhabit Earth in a parallel timeline. A bloody struggle for control of the future erupts across the timelines. Book 1 of the Timeliner series.
Sci Fi Books
ספרי מדע בדיוני