The KGB and the CIA have struck a bargain to eliminate former agents who might prove embarrassing to either of their espionage organizations. The chief of the CIA mission in Lebanon names Gabriel Lee as the next agent it wishes to have liquefied. Lee is vacationing in Israel when the assassins fail at their first attempt to kill him and he turns to his former mentor, also a retired agent, for assistance.
Buying... selling... and zapping your friends... It's all part of the game.