Quick recap
Summer 2012. Billy Knight, a mentally ill young man, turns up at the agency swearing he saw a child strangled when he was a boy. Soon after, government minister Jasper Chiswell hires Strike: he's being blackmailed by Billy's brother Jimmy and by Geraint Winn. Robin, a year into an unhappy marriage, goes undercover in Parliament as Venetia. Chiswell is found dead at home with a plastic bag over his head, and everyone calls it suicide. Strike proves it was murder. The killer is Raphael, the minister's son, who traps Robin on a boat before he's caught. Robin finds out Matthew is cheating with Sarah and moves out.
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