After more than a year of exploring with time travel, Jim Crampton has become accustomed to traveling into earth's past or future via the time complex he discovered by accident in the mountains outside of Seattle, Washington. Several things bother him however. Despite his technical skills he has made no progress in his attempts to understand how to control his destinations, or in understanding the basic operation of the time complex. Is there something special about the dates and locations pre-programmed into the machine? Is travel to times and places other than he has found even possible? There are clues that the answer to this question is yes, but he has yet to find a way to test what he suspects.
He has no more idea now than when he first chanced upon the time complex as to who or what built it, and why. Despite the hundreds of hours spent in the complex itself or traveling to other time periods, he has never encountered another traveler. The odd symbols on the equipment and what appear to be handwritten records lead him to suspect that the time complex was not created by future humans. If this is so, is there a sinister purpose behind the device, and why were the 'Builders' completely absent for so long? Perhaps they have finished their investigations, and have left. If so, why leave it powered and operational?
He is also concerned how the complex might be used if he reveals its existence to the wrong people, yet he has come to the conclusion that he needs help if he is to make any headway understanding the secrets locked inside the hidden complex. His decision to disclose the secret to two of his closest friends will set in motion a chain of events he could not have anticipated.
After a disastrous trip into the past to 'show off' his secret, Jim gains the trust of a fellow traveler from his own future. Together they assemble a select team to unravel the mysteries locked inside the complex. Their investigations lead to a race against time to determine the future of mankind.
