The Sigma Protocol (English, Paperback, Robert Ludlum)

Ben Hartman is on holiday in Switzerland when he meets one of his oldest childhood friends – who promptly tries to murder him. Hartman has no choice but to kill his attacker in self-defence, and barely survives the ordeal. But when he wakes up, he discovers that the bidy and all evidence of the fight have disappeared.

Anna Navaroo, a US government agent, is sent to look into a string og death in Europe. The only thing the victim have in common is an old OSS file, codenamed SIGMA. But as she starts to make progress, she is dragged of the case, attacked, and declared rogue.

Someone wants a secret kept and as the futures of Hartman and Navarro become entwined, it becomes obvious that there is more at stake than they could ever have imagined…
Source- Goodreads.com
E26,E34