Summary

After a teenage boy is found dead on a train, DCI Whitney Walker believes the notorious Carriage Killer is targeting Lenchester.

After a teenage boy is found dead on a train, DCI Whitney Walker believes the notorious Carriage Killer is targeting Lenchester. With Dr Georgina Cavendish by her side, they attempt to end this killing spree. But how can they get into the mind of a killer who has already killed twelve times in two years without leaving behind a single clue?