The shortlist (links are to Euro Crime reviews):
From the Dead, by Mark Billingham (Sphere)The criteria to be selected for the Best Crime Novel of the Year (!) are: "... open to British and Irish authors whose novels were published in paperback between 1st January 2010 and 31st May 2011."
Blood Harvest, by S J Bolton (Corgi Books)
61 Hours, by Lee Child (Bantam Books)
Dark Blood, by Stuart MacBride (Harper Fiction)
The Holy Thief, by William Ryan (Pan Books)
The Anatomy of Ghosts, by Andrew Taylor (Michael Joseph)