​Enter for a chance to win a signed copy of Ad Infinitum, Jim Harrington’s time-travel thriller about two enemies from Gettysburg, pulled into an impossible future. Winners are selected at random each month and notified by email. No purchase necessary.

​​Giveaway Rules:

No purchase necessary.  A purchase will not increase your chances of winning.  Open to legal residents of the United States, age 18 or older. One entry per person per drawing period.  Winners are selected at random each month and notified by email.  Prize consists of one signed copy of Ad Infinitum.  Approximate retail value: $29.95.  Standard U.S. shipping included.  Void where prohibited.  Sponsored by Dover & Blackstone / Jim Harrington.