Marco "Vulture" Vieri was once Interpol's top operative. Now, he's a ghost, living in self-imposed exile after a mission gone wrong cost him everything. His quiet life is shattered when he's contacted by his former handler, Lena Petrova. A stolen bioweapon, codenamed "Crimson Cipher," has resurfaced, capable of unleashing a devastating plague. Lena needs Vieri's unique skills, his ruthlessness, to retrieve it before it falls into the wrong hands.