In 'Hello, Who's There?', players assume the role of a quirky private investigator in a bustling metropolis plagued by mysterious disappearances. The game unfolds as players receive anonymous phone calls that hint at clues leading to the next victim. Each call offers branching dialogue options, allowing players to build a network of eccentric characters, including paranoid conspiracy theorists, tech-savvy introverts, and flamboyant detectives who each hold vital pieces of the puzzle. As they uncover hidden secrets while racing against time, players must decide whom to trust and how to respond to unnerving situations, making choices that will affect the outcome of their investigation and the fate of those involved.