Echo Location: A Forensic Psychological Thriller of Sound, Memory & Murder

When the walls remember murder, only one woman can make them speak.

Lena March doesn't believe in ghosts-she believes in physics. As an acoustic engineer specializing in sound archaeology, she's spent her career extracting forgotten conversations from building materials, turning architecture into evidence. But when a routine hotel renovation reveals a woman's scream preserved in the walls of a sealed room, Lena discovers something impossible: the voice belongs to a woman who died decades ago...