1941, London. When DCI Lilian Wyles finds a young woman murdered at King's Cross Station, she needs the help of someone she can trust, but Richard Davidson, her former Scotland Yard partner, has joined MI5 and is busy tracking black market routes outside of London, so for now, she is on her own. After having met the four queens of crime during a murder investigation two years earlier, DCI Wyles has kept in touch. But Agatha, Dorothy, Margery, and Ngaio are all involved in the war effort and have problems of their own. Agatha is volunteering at the University Hospital Pharmacy, where a dangerous anesthetic has been stolen. Dorothy has heard unsettling information from her connections at the BBC regarding members of the Royal Navy. Margery, who has been in the countryside helping families escape the city from the bombing, is worried about one of her charges whose older sister has gone missing. And Ngaio, who has relocated to New Zealand and is volunteering as an ambulance driver, has begun gathering secret intelligence from wounded soldiers and sailors that may put her in danger. When the four queens contact DCI Wyles for help, the information they share makes the final pieces of the puzzle fall into place. DCI Wyles once again finds herself collaborating with her old partners in crime to solve the mystery and close the case in this thrilling sequel, perfect for fans of Nicola Upson and Anna Lee Huber.