Alex Cahill and Logan Finch return in the gripping third novel in GJ Moffat's Glasgow-set crime series.

A passenger jet crashes in Denver, Colorado, with no survivors.

In Glasgow, Alex Cahill is surprised to hear from the wife of his former colleague in the US Secret Service - a man who was supposedly travelling on the doomed plane. The only catch is, there is no record of his name on the passenger list. And even Cahill's connections in the US intelligence agencies refuse to tell him what's going on.

In a desperate search to uncover the truth behind the disappearance of his old friend, Cahill and Logan Finch head to Denver and a confrontation with the FBI.

They are unaware however that a perfect storm of events is gathering across the globe. Events that stretch from Colorado, to the desolate expanse of war torn Afghanistan and to the mean streets of Glasgow - where DCI Rebecca Irvine is investigating a new drug that is killing users.

It is a deadly storm that will engulf them all.