FBI agents race to find a graffiti artist whose work appears to foretell calamity

A truck veers off an overpass and falls onto the interstate below, right into the middle of the morning commute. Many people lose their lives, and the city of Seattle reels from the disaster.

When an elaborate mural that appears to glorify the event is discovered, it is seen as being in very poor taste. That's until it transpires it was painted two days before the crash.

Was it a warning by some psychic or savant? Or the work of a psychopath who played a role in the tragedy, seeking to cause as much pain and disruption as possible?

When a similar mural is discovered, and another terrible incident occurs, it becomes a task for Special Agent Ilona Farris's Unsolvable Crimes Unit and their powerful AI computer.

It is a race against time to find the artist, establish where the next event will occur, and stop whatever devious mind is responsible from causing further havoc and destruction.