Death Day/Renegades by Shaun Hutson
DEATH DAY - Four hundred years ago, a woman died in agony to keep the secret of a golden disk and went to her grave with it hung around her neck. Now, in a desolate graveyard, a workman has unearthed the amulet by chance and decides to keept it. His first mistake...Wherever the amulet is found, ancient evil - hideous, powerful and vile - is once again reborn. RENEGARDES - Immortality - the ultimate secret. David Callahan needs to find the answer - he's being tracked down by hired killers...In a race against time, a trail of violence and terror leads from a desecrated church in France, to London, and on to Ireland where modern terrorism battles against ancient powers and a terrible secret is revealed...