Rachel is hard at work on a new, more efficient version of the cure while Alisha decodes a message found on a cell phone recovered from the Immunes on land. A suspicious death on the ship forces Chandler to launch a murder investigation, causing dissent among the crew and threatening to upset good order and discipline. Armed with new information provided by Michener, Nathan James heads to New Orleans, only to find that the Immunes have a terrifying surprise in store for them there.