The most potent ghosts in Doug Dorst’s debut novel Alive in Necropolis are the spectres of regret that haunt protagonist Mike Mercer. Mercer is that kind of pushing-thirtysomething whom we’ve all known―or been―grinding through wage-slave temp work, shuttling from periods of unintentional celibacy to codependent non-relationships, and drifting listlessly away from friends who’ve found their niches in the adult world of mortgages, 401ks, and families.