: The investigation reveals that Raff Chiswell , Jasper’s illegitimate son, was the one who killed him. Raff’s motive was a combination of revenge for being cut out of the will and a plan to steal a rare Stubbs painting worth £20 million.
: Many fans noted that the TV version successfully streamlined the dense plot of the novel while keeping essential character moments, such as Strike and Robin's conversation by the side of the road. [S4E4] Lethal White: Part 4
Viewers and critics generally praised this finale as a "solid" conclusion to the four-part adaptation. : The investigation reveals that Raff Chiswell ,
: The mystery Billy Knight witnessed as a child is resolved; it was actually a young Raff being abused by his older half-brother, Freddie, which Billy had misinterpreted. Critical Reception Viewers and critics generally praised this finale as