The Woman in the Big Hat by Baroness Orczy

When a well-known socialite is seen leaving the scene of a murder, suspicion falls on her immediately—but the case is more tangled than it first appears. Detective stories swirl around a mysterious woman whose charm hides sharp intelligence and dangerous secrets. The plot slowly reveals motives of jealousy, deception, and revenge. A tale of elegant settings and cunning minds. Justice comes dressed in style—and with a twist.