Frequency of the Dead

Frequency of the Dead is the first novel Jonas Saul wrote over twenty years ago.
Detective Bryce Jacob is on edge. His superiors are threatening suspension, but he won't-he can't-give up the hunt for his son's murderer. At a routine meeting with a confidential informant, Detective Jacob and his CI are injured in something the media call an "air quake." Over a week later, Detective Jacob wakes from a coma with a new talent-he can see the other side.
When a strange woman appears in his hospital room with a warning, he learns he must work with his CI to stop an imminent attack against Los Angeles. The people responsible for the air quake have a larger device, and in a few days, they plan to detonate, killing thousands of people. But before that, they want Detective Jacob dead. They tried once but killed his son instead. They failed a second time with the air-quake device.
Determined to stop them, Detective Jacob goes after them.
But they're ready and waiting for him.
They won't miss again.