A hotel in Rome. An old man lying dead in the lobby. He was the owner, and he’d been regaling you and your friends with stories the night before; missions in exotic locales, adventures of his youth, a secret office with a secret will. He said the person who finds it will inherit everything.
The Polizia are on their way, but it will take time. Find the will and you and your friends can split the inheritance. That is, if the cops don’t get there first.