The Echo Chamber. Standalone Psychological Thriller

John Doe lives in a world where nothing is quite what it seems. A grieving archivist haunted by the memory of his late wife Sarah, he believes he's slowly losing his grip on reality-until he discovers a basement apartment in his old family home that seems to hold secrets about her past. As Sarah's diary entries begin appearing in places they shouldn't, John's carefully constructed life starts to unravel.
The apartment reveals a woman named Ashley Vance who shouldn't exist, yet speaks of John with terrifying intimacy. Between the walls, between the pages of Sarah's journals, and between his own memories, something-or someone-is watching. What begins as an investigation into a stranger's life becomes a descent into madness. With every revelation, John's world fractures further: the Sarah of his memories, the Sarah who wrote the diary, the Sarah who seems to know what he hasn't yet told anyone.
The more he searches for answers, the fewer truths remain. Because in The Echo Chamber, there is no escape from the voices in your head-and no one to trust, not even yourself.