Who is Pilgrim? Tom Scheffler and Jerry Flint are going to find out the hard way, because the mysterious Pilgrim is going to have them fighting for their lives centuries, millennia before they were born. Pilgrim is the rogue time traveler trying to change the course of history for his own ends. And even if the two hapless adventurers survive Pilgrim's deadly game, they have no assurance that they will ever see their own timeline again.
Used availability for Fred Saberhagen's Pilgrim
November 1997 : USA Mass Market Paperback