The Emerald Line — What Waits Below Boston

A subway maintenance worker vanishes without a trace in the tunnels beneath Boston, and the case that follows refuses to make sense. Transit inspector Evren Locke and city archivist Scarlett Voss are pulled into the search almost by accident, following a set of maintenance logs that don't match anything in the official record. What they find at the end of that trail is a network of passages sealed off generations ago, hidden beneath the working lines of the modern T, forgotten by everyone except the people who built them. The deeper Locke and Voss go, the less the missing worker looks like an isolated case, and the more the city itself starts to feel like it's been hiding something since the first tunnels were dug.
Old maps don't match new ones. Names appear in records that were supposedly destroyed. And something down there has been keeping track of who comes looking. The Emerald Line is a slow-burn thriller about the spaces underneath the places we think we know, for readers who like their mysteries close to home and their cities holding more than they let on.