London is tuned to a dead station.

By day, Kasra is a stage magician in a smoke-filled Brixton pub. By night, he is a Walker—a soul capable of slipping into the "Grey," the dangerous margins between our world and the afterlife.

When Kasra witnesses a soul harvested by a man in a charcoal coat, he is pulled into a conspiracy that threatens to rewrite reality. Julian Vane is building a "Choir" of the dead—a broadcast signal designed to welcome a deity of stolen memories known as the King of Rags.
To stop the signal, Kasra must hunt Vane to the highest point in the city and master the Viper’s Coil—a technique that can turn a ghost into a weapon, but may leave the man a hollow shell. In a city of rain and static, Kasra must decide what he is willing to sacrifice to lock the Door.

Because when the King of Rags arrives, there will be no memories left to save..