They might have been better off if he had, Zoe thinks. She's still not happy about the way he chose to end his life - who he called upon to help him with it, and the letters that he'd sent. But that was nearly a year ago now, and it's useless to be angry now.

"It's really...too precise," she says as she kneels down. "For it not to be someone who knew what they were doing." But Briony Williams is the only other poison expert she can think of, and Briony has her own poison garden.