In order to learn about immortality and life after death, Peter and Sarkar create three electronic simulations of Peter's own personality after a comprehensive scan of his mind and memories. From one, they seek "which neural nets are activated exclusively by biological concerns, and then zero those out" (p. 131), so that it is purely intellect; they call it Spirit. From the second, they edit all fears of aging and death, so that it "feels" itself to be immortal; they call this one Ambrotos. The third is a control, with Peter's knowledge up to the point of the brain scan. At first, the three "sims" enjoy exploring all that the Internet has to offer. One sim, however, hires a hit man to kill Hans and then, days later, Cathy's father.