News of the explosion in Changming district travels back to Peacekeeper Corps. Li Bi learns that "stone grease" is an expression referring to the explosives. Research at the Security Bureau reveals that Xu Bin and Zhang Xiaojing in fact know each other. Li Bi suspects Zhang Xiaojing intentionally led Wolf Squad to the Counsellor’s mansion as a way to get even with him. Lin Jiulang secretly sends a message to the Emperor accusing the Crown Prince of four serious crimes. The Crown Prince finds out about the accusation against him and looks to Li Bi to solve the case as soon as possible to vindicate his name.
昌明坊爆炸的消息传回靖安司，李必惊觉阙勒霍多就是指伏火雷。大案牍术推演出徐宾与张小敬曾是旧识，李必怀疑张小敬挟私报复故意将狼卫引致右相府。林九郎向圣人密奏，状告太子四大罪名。太子获知消息，希望李必能迅速破案，以证清白。张小敬顺着大车滴落的油脂追踪而去，崔器正要带旅贲军跟随支援，姚汝能神秘的口传了来自李相的命令，责令崔器听从上级部队右骁卫的调遣。
