"You had no trouble installing your woman?" asked Markham.
"A cinch. Everything went like clockwork. At a quarter to six the doc shows up; then at six comes the woman from the Central Office. After the doc has put her wise to her new duties, she gets into her uniform and goes in to Mrs. Greene. The old lady tells the doc she didn't like this Miss Craven anyway, and hopes the new nurse will show her more consideration. Things couldn't have gone smoother. I hung around until I got a chance to tip our woman off about the galoshes; then I came away."
"Which of our women did you give the case to, Sergeant?" Moran asked.
"O'Brien—the one who handled the Sitwell affair. Nothing in that house will get by O'Brien; and she's as strong as a man."
"There's another thing you'd better speak to her about as soon as possible." And Markham related in detail the facts of Von Blon's visit to the office after lunch. "If those drugs were stolen in the Greene mansion, your woman may be able to find some trace of them."
Markham's account of the missing poisons had produced a profound effect on both Heath and the Inspector.
"Good heavens!" exclaimed the latter. "Is this affair going to develop into a poisoning case? It would be the finishing touch." His apprehension went much deeper than his tone implied.
Heath sat staring at the polished table-top with futile consternation.
"Morphine and strychnine! There's no use look-
