Noisy Jewish Detective

My great-uncle wrote detective novels about Mr. Emanuel E. Rothschild, the self-described “poorest but most amiable of the Rothschilds,” a stout and beaming “confidential detective” who worked in Manhattan. The detective's sidekick and chronicler was an Upper East Side deb with shingled blonde hair and an intrepid disposition. She was his client in the detective's first book, The Smart Set Murder, because her big sister was being blackmailed and needed clearing. The deb stuck around for all the books afterwards, and she and Mr. Rothschild made for a combination.