People were used to thinking that Sherlock Holmes cared about nothing. After all, he was weird, and cold to everyone so how could he care about something or someone?

That had always given him an advantage, knowing criminals could never find his weakness... But then they did, they found them and they took them away

Sherlock had been looking for them like crazy, he had set up an investigation and convinced both Mycroft and Lestrade to help him out. He just wants to bring them home