The Osterman Weekend is a thriller novel by Robert Ludlum.

[1] John Tanner, Director of News of a US TV network, is convinced by a CIA agent that the friends he has invited to a weekend in the country are engaged in a conspiracy, called Omega, that threatens national security.

Everything John Tanner thinks he knows about his closest friends is overturned, and he is set against them.

When Omega finally reveals itself, he realizes that he has been manipulated from the very start.

You can help Wikipedia by expanding it.See guidelines for writing about novels.