Dorian Wild has a car, a good apartment, a junior partnership in a law firm, and a solid relationship. Then a seeming ghost walks out of an elevator floor and re-balances a miner's panning dish on top of her head. Suddenly Dorian Wild also has danger, tragedy, mystery, break-ins, mayhem, an unscrupulous megacorp on her trail, and a whole new concept of reality. Especially when it involves a nineteenth-century Irish activist called Jimmy Keenighan, who has ended up in her time and place for reasons neither of them understand.

The Time Seam brings their escalating cycle of dangers and discoveries to a climax, and a close.