In 'Hello, Who's This?', players step into the shoes of dubious phone detective Sam Spade, who receives a series of mysterious phone calls from different characters each day. Each caller presents a new mystery ranging from bizarre to thrilling—such as a heist in the art world, a conspiracy among city officials, or even an alien job placement agency. Players must choose how to respond, gather clues, and unravel the web of connections between each character, all while trying to piece together the overarching story. The game's branching narratives and multiple endings ensure that no two playthroughs are the same, pushing players to think critically and explore imaginative solutions to unusual dilemmas.