He couldn’t allow Olivia to marry Trevelyan if he was indeed afflicted; still, he had no desire to be arrested himself for attempted poisoning of the man.

Stubbs, always gregarious, was allowing himself to be drawn into a discussion of the Indian campaign; the papers had carried news of Clive’s advance toward Calcutta, and the whole of London was buzzing with excitement.

“Aye, and isn’t one of me cousins with Himself?” the apothecary was saying, drawing himself up with evident pride. “The Eighty-first, and no finer class of soldiers to be found on God’s green earth”—he grinned, flashing good teeth—“savin’ your presences, sirs, to be sure.”

“Eighty-first?” Stubbs said, looking puzzled. “Thought you said your cousin was with the Sixty-third.”

“Both, sir, bless you. I’ve several cousins, and the family runs to soldiers.”

His attention thus returned to the apothecary, Grey slowly became aware that something was slightly wrong about the man. He strolled closer, eyeing Scanlon covertly over the rim of his cup. The man was nervous—why? His hands were steady as he poured the liquor, but there were lines of strain around his eyes, and his jaw was set in a way quite at odds with his stream of casual talk. The day was warm, but it was not so warm in the shop as to justify the slick of sweat at the apothecary’s temples.

Grey glanced round the shop, but saw nothing amiss. Was Scanlon concealing some illicit dealings? They were not far from the Thames here; Puddle Dock, where O’Connell’s body had been found, was just by the confluence of the Thames and the Fleet, and petty smuggling was likely a way of life for everyone in the neighborhood with a boat. An apothecary would be particularly well-placed to dispose of contraband.

If that was the case, though, why be alarmed by the presence of two army officers? Smuggling would be the concern of the London magistrates, or the Excise, perhaps the naval authorities, but—

A small, distinct thump came from overhead.

“What’s that?” he asked sharply, looking up.

“Oh—naught but the cat,” the apothecary replied at once, with a dismissive wave of his hand. “Wretched creatures, cats, but mice bein’ more wretched creatures still . . .”

“Not a cat.” Grey’s eyes were fixed on the ceiling, where bunches of dried herbs hung from the beams. As he watched, one bundle trembled briefly, then the one beside it; a fine gold dust sifted down, the motes visible in the beam of light from the door.

“Someone’s walking about upstairs.” Ignoring the apothecary’s protest, he strode to the linen curtain, pushed it aside, and was halfway up the narrow stair, hand on his sword hilt, before Stubbs had gathered his wits sufficiently to follow.