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?