To Nick and Giorgio (also to Ken Hoff, which he hates), he’s a gun for hire named Billy Summers. To the inhabitants of the Gerard Tower, he’s a wannabe writer named David Lockridge. Ditto the residents of Evergreen Street in Midwood. And now, on Pearson Street—nine blocks from Gerard Tower and four safe miles from Midwood—he is an overweight computer geek named Dalton Smith. Come to think of it, there’s even a fourth life: that of Benjy Compson, who is just enough not-Billy so Billy can look at painful memories he usually avoids.