London, 1923.

A difficult time for a woman who passionately wants to advance in academia. But Saffron is an unusual girl. She has already solved a dangerous case of poisons and at the same time saved the university from bankruptcy, and now she has been entrusted with conducting her own research! It seems that all dreams have come true, but a knock on the door changes absolutely everything...

A serial killer has appeared in London: his victims are women who are in no way connected with each other, and the only thing that unites them is unusual poisonous bouquets, tied with black ribbon. Saffron immediately becomes a consultant on the case, because human lives are at stake.

Together with her colleague, Dr. Michael Lee, she will have to go to the most seedy place in London, where every visitor is suspicious, to the luxurious country mansion of the mysterious lord and into a magnificent theater box, behind the curtains of which insidious plans are born.

Will Saffron be able to catch the killer before he sends the next bouquet?