I hate to break it to you Poppy, but i have to escape before they get me.
NO! Don't leave Gus i beg you.
Gus left the orphanage and had shown Poppy a secret door he had escaped out of. Poppy was missing her brother so much that she decided she had to find him. She found the secret door and escaped. She decided to use Bartholomew clothes and cut her hair to look like a boy so she could be under cover.
Poppy searched and searched for her brother but in the end, she had no luck.