A truck driver loses control in central Edinburgh, ploughing into a crowded bus stop and spilling his vehicle's toxic load. The consequences are devastating.

DI Tony McLean witnesses the carnage. Taking control of the investigation, he soon realises there is much that is deeply amiss - and everyone involved seems to have something to hide.

But as McLean struggles to uncover who caused the tragedy, a greater crisis develops: the new Chief Superintendent's son is missing, last seen in the area of the crash . . .