For almost half a century, the text of an agreement with the signatures of interested parties, lost during a plane crash, resting at the bottom of a Scottish lake, extending the lease of Hong Kong by Great Britain for a hundred years. The mafiosi of Sicily and the USA decide to find this document and use it for their own purposes. At the same time, on instructions from the intelligence services, the brilliant international terrorist Sean Dillon is included in the search for an agreement.