The police go through the last few days before the accident, re-tracing the steps of the four individuals trying to find any clues...
The problem is it all becomes a bit over complicated, rambling and dull. After the umpteenth lengthly monologue by a fairly one dimensional character you do tend to lose track of what the book is actually about. The premise is great, the execution lets it down quite a bit unfortunately. The final police reasoning and logical investigation at the end does save things a bit, but only a bit.
