皇帝巡海之际，太子建文亲眼目睹了自己亦师亦友的郑提督突然弑君，反被朝廷诬陷为弑父夺位，慌乱中驾驶了青龙灵船逃回泉州欲返回金陵向燕王叔叔，郑提督接受监国燕王的命令回到泉州对建文进行缉拿，建文太子识破

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