Length: 7 daily email letters

Seven days. No light. No way out.

When a subway train derails beneath the city, a small group of strangers is left trapped in the dark. One survivor begins writing letters to you, using the last battery life of a phone. At first, the notes are a lifeline—confessions, memories, a desperate attempt to cling to hope.

But as the hours turn into days, things begin to change. Stories don’t add up. Shadows move where no one should be walking. And one by one, people start to disappear.

Seven Days Underground is a serialized epistolary thriller delivered directly to your inbox—seven letters across seven days. Each message drags you deeper into the claustrophobic dark, until the line between rescue and ruin vanishes.

Do you dare read them all? The seventh letter may be the last.