Called back to the USA by the frantic government, McLane and Jones discover that General Carrington has kidnapped Wally Sheridan, President of the United States! Holed up in a secret base he's turned into a fortress, Carrington intends to put Sheridan on trial on live TV and expose him as the Number I of the conspiracy. To do that, he's going to need XIII's help in bringing in his main witness: the Mongoose!