Who Killed Harlowe Thrombey? (Choose Your Own Adventure #9) by Edward Packard

Someone murdered Harlowe Thrombey. Only you can find out who did it.

Millionaire Harlow Thrombey hired you to find out who was out to get him. But before you even got started, someone laced his bedtime brandy with arsenic. Now you have a murder case on your hands!The suspects include his wife jane, his nephew Chartwell, and his niece Angela - all heirs to his enormous fortune.