The agency is hired by a television weather forecaster they nickname Weatherman to find out who is sending him mysterious postcards.¹ For a while, the agency is at a loss as to who the person (Postcard) could be until Robin follows a hunch that takes her to the National Portrait Gallery.² Barclay takes over the case and confirms that Robin’s hunch was right.³ 

“’Bloody well done,’ Strike told Barclay.
‘It’s Robin’s win,’ said Barclay. ‘She made the pass. I jus’ tapped it in.’” ⁴

^{1: Troubled Blood, Chapter 7
2: Troubled Blood, Chapter 16
3, 4: Troubled Blood, Chapter 39}