Who poisoned Charles Petrie? Dr James Collymore, a man familiar with poisons, a man harbouring a dark secret that, if exposed, would ruin his career; Florrie Williams, the maid who supplied Charles with his bedtime drink; Bert Kemp, a disgruntled groom who used poisons in his work, who four months earlier had predicted Charles’ dying day; Mrs Jennet Quinn, a lady’s companion with a deep knowledge of poisons, and a deep fear of dismissal; or Grace Petrie, Charles’ wife of four months, a woman with a scandalous past, a woman shunned by polite society. Buy on Amazon