In 'Whose Echo Is This?', players step into the shoes of Cassie, a sound designer who stumbles across an ancient soundboard hidden in the attic of her late grandfather's home. Each echo from the board conveys messages from the past, allowing players to piece together the dark history of her family and the mysterious forces at play. As Cassie interacts with the echoes, they must solve enigmatic puzzles and make choices that alter the course of the story, leading to multiple endings based on how they unravel family secrets and confront spectral adversaries.