The Negotiator: by Frederick Forsyth.

The art of negotiating, the kidnappers that seem to know what moves to expect and are always one step ahead, the boy that runs in an emaciated state towards freedom, and then the negotiator has to go after the kidnappers and those behind them. A mystery thriller about a conspiracy that could bring world close to brink of peril - as usual, and also as usual, brilliantly written.