话说宋江在梁山泊落草为寇，声名远扬。有一天，他收到一封密信，信中内容是京城内有人愿意里应外合，协助他攻打京城。宋江大喜，立即召集众头领商议。众头领中，吴用计谋颇多，他认为此事风险极大，必须谨慎小心。于是，他建议派人暗中调查，确认京城内是否有可靠的内应，以及他们是否真的能够在关键时刻给予支持。同时，他提醒宋江，里勾外连的行动必须保密，一旦泄露，后果不堪设想。宋江采纳了吴用的建议，暗中派遣探子前往京城，经过多方调查，终于证实了京城内确实有人与梁山泊暗中联系，并约定在某日一起发动进攻。宋江率领大军攻打京城，京城内应果然配合默契，里应外合，最终攻破京城。然而，好景不长，消息走漏，朝廷大军很快就追赶上来，宋江兵败身亡，留下千古遗憾。
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