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Someone is killing secret service agents, past and present, from the Slough House team. Jackson Lamb can't understand it. Well, what he actually can't understand is why, having seen them, anyone would bother. But the deaths are mounting up and something needs to be done. After all ''when things went awry on Spook Street, they generally went the full Chris Grayling.'' Over at Regent's Park, Diana Taverner is quietly jubilant about an operation which saw the perpetrator of a Novichok poisoning in the UK (three people seriously injured and one dead) dispatched. It isn't just the message that was sent: she's also delighted that she managed to fund the operation off the books. Some private money was brought in. She won't always be so jubilant about this.