When a crew member is found dead on board the Trident nuclear
submarine, HMS VIGIL, the Scottish Police are called on to investigate. The
catch? The UK’s nuclear deterrent must remain unbroken, so the
submarine stays on patrol and Detective Chief Inspector Amy Silva must
go on board to investigate. Although the death was written off as an
accidental overdose, Amy suspects foul play. But the crew close ranks in
the face of Amy’s questioning, and a new threat overshadows her inquiry.
