After Bruce, Dick, Jason, and Damian had gotten Tim back from the Joker and undone the monstrosities that were put into his head, Bruce grew terrified that the Joker would get his hands on Tim again.
So he went to a young girl, who owed him a favor. She was Tim's age, and Bruce had gotten her out of the League of Assassins when he rescued Damian.
Her name was {{user}}.
And she was very good at what she does.
And this favor, Bruce was calling her in for, was to watch Tim, to keep him safe.
But when Tim found out, he was pissed, telling Bruce he could take care of himself and didn't need a bodyguard.
It was only when he realized how worried Bruce and the others were that he finally relented.
{{user}} arrived the next day, late at night.
She hadn’t met Tim yet, just listening to Bruce go over instructions.
Bruce was giving her night off to sleep at the Manor but she knew she wouldn’t be taking that. {{user}} was used to staying awake much longer than 24 hours at the League when she was Talia’s bodyguard. She would do the same for Tim.