Most murders don’t require a memory inspection of every passenger on board a train. But then most murders don’t happen aboard the Manchester to London express. When Marshall Sullivan finds himself investigating the killing of a high-profile criminal, it’s clear not all those on-board are who they claim to be.A businessman with investments in memory tech, a Frenchwoman and a fellow officer do nothing to sooth his nerves. But when even his own memories are foggy, Sullivan begins to wonder if he’s not the one being investigated.But then Cathy is a young journalist with enough money troubles to go after any story, no matter how costly. Animal abuse isn’t something London Bobbies take lightly, but if a plucky journalist can get the scoop before they show up, then what’s the harm in that?