The French Powder Mystery by Ellery Queen

In this captivating mystery, a seemingly ordinary day at a bustling New York department store takes a sinister turn when a woman's body is discovered in a display window. The investigation, led by a brilliant amateur detective and his astute police inspector father, delves into the complex web of secrets and lies surrounding the store's influential owners and their employees. As they unravel the clues, they encounter a series of red herrings and unexpected twists, ultimately leading to a shocking revelation that challenges their perceptions of justice and morality.