“Lieutenant Jonah Francis Agyeman, Royal Engineers. Aged 21, unmarried” is how Lula Landry‘s half brother is introduced in The Cuckoo’s Calling. Jonah figures prominently in the case and, at the end of the book, returns to London from his second tour of duty in Afghanistan after being summoned by the Metropolitan Police.

He and Lula shared the same father, but never met — only talking a few times on the phone.