"A riveting, beautifully written, fugue-like novel of AIs, memory, violence, and mortality. Not far in the future the seas have risen and the central latitudes are emptying, but it's still a good time to be rich in San Francisco, where weapons drones patrol the skies to keep out the multitudinous poor. Irina isn't rich, not quite, but she does have an artificial memory that gives her perfect recall and lets her act as a medium between her various employers and their AIs, which are complex to the point of opacity. It's a good gig, paying enough for the annual visits to the Mayo Clinic that keep her from aging. Kern has no such access; he's one of the many refugees in the sprawling drone-built favelas on the city's periphery, where he lives like a monk, training relentlessly in martial arts, scraping by as a thief and an enforcer. Thales is from a different world entirely--the mathematically inclined scion of a Brazilian political clan, he's fled to L.A. after the attack that left him cr