It is the summer of 1950–and at the once-grand mansion of Buckshaw, young Flavia de Luce, an aspiring chemist with a passion for poison, is intrigued by a series of inexplicable events: A dead bird is found on the doorstep, a postage stamp bizarrely pinned to its beak. Then, hours later, Flavia finds a man lying in the cucumber patch and watches him as he takes his dying breath.

For Flavia, who is both appalled and delighted, life begins in earnest when murder comes to Buckshaw. "I wish I could say I was afraid, but I wasn’t. Quite the contrary. This was by far the most interesting thing that had ever happened to me in my entire life."

For Flavia, the summer begins in earnest when murder comes to Buckshaw: "Did the stranger die of poisoning? There was a piece missing from Mrs. Mullet’s custard pie, and none of the de Luces would have dared to eat the awful thing. Or could he have been killed by the family’s loyal handyman, Dogger… or by the Colonel himself!" At that moment, Flavia commits herself to solving the crime — even if it means keeping information from the village police, in order to protect her family. But then her father confesses to the crime, for the same reason, and it’s up to Flavia to free him of suspicion. Only she has the ingenuity to follow the clues that reveal the victim’s identity, and a conspiracy that reaches back into the de Luces’ murky past.