Reactionary 23rd-century terrorists will change history unless the elite Anti-Revision Command, the ARC Riders, aided by war veteran Maj. Rebecca Carnes, can find them. In a manhunt that ranges from the 26th century to 50,000 B.C., the ARC Riders must stop the killing before they lose their one chance to untie the fatal knots of time.
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Used availability for David Drake's ARC Riders
June 1995 : USA Mass Market Paperback
September 2009 : USA, Canada Kindle edition