Ubik

by Philip K. Dick

“The precog affected by her still sees one predominant future; like you said, the one luminous possibility. And he chooses it, and he’s right. But why is it right? Why is it luminous? Because this girl—” He shrugged in her direction. “Pat controls the future; that one luminous possibility is luminous because she’s gone into the past and changed it. By changing it she changes the present, which includes the precog; he’s affected without knowing it and his talent seems to work, whereas it really doesn’t. So that’s one advantage of her anti-talent over other anti-precog talents. The other—and greater—is that she can cancel out the precog’s decision after he’s made it. She can enter the situation later on, and this problem has always hung us up, as you know;

Pats anti-talent, she's special