Marc Finn
After his impetuous musician girlfriend, Samantha, dies in an accident shortly after they had a fight (and nearly broke up), a grief-stricken British businessman, Ian Wyndham, living in London gets a chance to relive the day all over again, in the hope of changing the events that led up to her getting killed.
Space Marine Captain Darius of the Dark Angels and his command squad join Inquisitor Krieger in solving the mystery of a strange key.