Her decision to seek out her father takes her on a steampunk version of Planes, Trains and Automobiles, but with an airship, a boat, and a steam-driven train that is being pursed by the deadliest train the war has to offer. There are also a lot of questions ranging from “what dread disease is killing veterans” to “what happened to the missing Mexican soldiers” to “what is hidden under heavy guard on this blasted train.” None of these questions have good answers, though, and as much as Mercy would like to ignore them, she is not the “sit back and do nothing type,” and thus finds herself in the middle of the action with guns blazing and a determined glint in her eye. Mercy will get to Seattle come hell or high water, and Priest very nicely keeps her and her fellow passengers battling along the entire trip.