A familiar face at a funeral sets off the appalling Jackson Lamb, despatching his Slow Horses to settle a score. There's a missing teenager and a new face in whose transgression is particularly nasty even for Slough House, and it all comes down to a snow-bound chase through deepest darkest Wales. Oooh, this one left a mark.

Decided to have a relisten, this is the one with the snowy shenanigans in Wales and Lamb being exceptionally vile.