Flashbacks reveal how brilliant explosives expert Mac and sharpshooter-bodyguard Jack met in Afghanistan and how their initial hostility bloomed into true friendship. The group has rushed Cage to a hospital, staying until getting word that she will recover. Returning home with Jack, Mac finds that the house has been expertly rigged with super-heavy explosives. Seeing a unique combination of triggering device and explosive material, Mac to deduces from the Ghost's patterns that the bomb was set to distract authorities from an even larger bomb in downtown Los Angeles. Fellow explosives expert Charlie Robinson must disarm it after Bozer helped find it, but the two are linked, which is very hard to undo as it must be 'speed of light' simultaneous, which requires various Macgyverisms on all fronts.
—KGF Vissers