Vampire "unseen"

Two men are dead, brutally murdered on a Romanian hillside. The prime suspect is resourceful, intelligent and completely invisible. For Romanian detective Corneliu Latis, the assignment should have been easy. Go to London and liaise with the British authorities to track this man. But as Corneliu unlocks the puzzle he discovers that things are not as they first seemed, for beyond the mystery of an unseen man, lay a dark legacy of secrets that must remain buried at all costs.