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The police also found no medicines in Orme's rooms except for a bottle of sleeping pills and two labels - that of arsenic and prussic acid.

The factory had been producing acrylic glass and prussic acid.

Other sinister details emerged: Lizzie was reportedly seen trying to buy highly poisonous prussic acid the day before the killings.

“I would rather give a healthy boy or a healthy girl a phial of prussic acid than this novel,” wrote the editor of the Sunday Express.

We believed it was prussic acid, a worrying thought since we knew that our gas masks provided no protection against that chemical.