« The Furthest Station » Ben Aaronovitch

There’s something going bump on the Metropolitan line and Sergeant Jaget Kumar knows exactly who to call. It’s PC Peter Grant’s speciality …

Only it’s more than going bump . Traumatised travellers have been reporting strange encounters on their morning commute, with strangely dressed people trying to deliver an urgent message. Stranger still, despite calling the police themselves, within a few minutes the commuters have already forgotten the encounter — making the follow up interviews rather difficult.

So with a little help from Abigail and Toby the ghost hunting dog, Peter and Jaget are heading out on a ghost hunting expedition.

Because finding the ghost and deciphering their urgent message might just be a matter of life and death.