When you try to save everybody, sometimes you save nobody - not even yourself.When Connor Rourke, premier supernatural locksmith in the Boston area, agrees to do a favor for his maybe-more-than-a-friend, the mage Elise, he has no idea what he's signing up for. Looking for a missing professor? In London? Wait, somebody's dead? ...and then the zombies show up. Kind of. Some disagreement on that point.Magical action, international supernatural politics, a little bit of romance... Mechanical Advantage is urban fantasy with a side of snark, the second book in the Origin Key series.