<P> Sherlock offers to trade Magnussen 's information on Mary for the state secrets contained in Mycroft 's laptop . However , Magnussen is aware that Sherlock is setting him up in a trap . Magnussen then explains Sherlock 's plan to John : security services looking for the laptop using a GPS tracker it contains will raid Appledore and , upon finding the laptop , will have a legal reason to search the blackmail vaults . Magnussen , with visible joy , reveals that the plan will not work because Appledore 's vaults do n't physically exist , but are stored in his mind palace . By giving Magnussen the laptop , Sherlock and John are now guilty of attempting to sell government secrets and can be imprisoned for high treason , whereas Magnussen remains legally untouchable . When Mycroft and the police arrive , Sherlock coldly shoots Magnussen in the head , having realised that this is the only way to free his friends and everyone else from his power . </P>
<P> Sherlock offers to trade Magnussen 's information on Mary for the state secrets contained in Mycroft 's laptop . However , Magnussen is aware that Sherlock is setting him up in a trap . Magnussen then explains Sherlock 's plan to John : security services looking for the laptop using a GPS tracker it contains will raid Appledore and , upon finding the laptop , will have a legal reason to search the blackmail vaults . Magnussen , with visible joy , reveals that the plan will not work because Appledore 's vaults do n't physically exist , but are stored in his mind palace . By giving Magnussen the laptop , Sherlock and John are now guilty of attempting to sell government secrets and can be imprisoned for high treason , whereas Magnussen remains legally untouchable . When Mycroft and the police arrive , Sherlock coldly shoots Magnussen in the head , having realised that this is the only way to free his friends and everyone else from his power . </P>
who did sherlock shoot at the end of season 3
who did sherlock shoot at the end of season 3
Magnussen
Magnussen