Die Like a Dog (Mike Shayne - Dell 1930)

It's 11:00 am, and Mike Shayne has just poured himself a cognac, when Henrietta Rogell strolls into his office. Normally, Shayne would extend no special favors to a wealthy client, but his checking account is nearly empty, and he's willing to straighten his tie for the sake of a millionaire—especially when she's come about something as lucrative as murder. Miss Rogell's brother, John, died 2 days before. The coroner ruled it a heart attack, but Henrietta is convinced he was poisoned, and she will pay handsomely for Shayne to prove it.