Slightly more info on these games

IMDb has pages for both Murder, Anyone? (https://www.imdb.com/title/tt0084376/) and Many Roads to Murder (https://www.imdb.com/title/tt0085982/), which include the cast for both games, respectively.

The page for the latter has this to say about the plot of the game: Self-narrating private detective Stew Cavanaugh is back to solve another murder, this time at the elite Adventurers Club. Cavanaugh spent early life in odd jobs and the Army and then worked his way through Harvard, where he met some of the people involved. The suspects are Marcus Sandor - a Harlem rooming house resident who works as a waiter at the club, Tracey Lowe - Granville's sister and ward who's under his control until her 21st birthday, Lenore Krieger - an independent woman who owns an import-export business, Bill Donovan - also a Harvard graduate who now runs his own company, Juna Jamael - exotic chanteuse at a Harlem nightclub called the Jazz Spot, Granville Lowe III - Cavanaugh's Harvard roommate who now manages his own investments, Percy Wilder - a member of the Adventurers Club with a penchant for drink, and Sabrina Todd - a woman in her late twenties and an unknown commodity. Stew's only allies in this murder investigation are Maxine Blair - Stew's ambitious assistant who wants to be the first woman with her own private detective's license, and the players themselves who get to choose between storyline paths to solve the case by discovering the murderer's identity, motive and the murder method. When you think you've had it all figured out, the endgame starts where you accuse a suspect and try to prove that he or she did it. There are 16 endings, just like in the first game.

On the page for the first game, there is a comment from someone who actually played it. Not too much extra info is in this comment, but they do mention that the game itself is less than 30 minutes long.