In Chains, how does Curzon offer to help Isabel earn her freedom?

Curzon
is a huge help to Isabel in a lot of ways throughout the entire book, but he first broaches the
subject of helping her obtain freedom in chapter 6. This is the chapter that has Curzon guiding
Isabel to the Tea Water Pump. In addition to helping her find her way there, he also secures
some much needed food for Isabel.

As friendly as Curzon is to Isabel, I can't
say that Isabel is as friendly back to Curzon; however, that is to be expected. She has just
lost her freedom, she and Ruth are in completely foreign territory, and the Locktons are
horrible owners. Isabel has already been struck once at this point in the story. Curzon knows
that the Locktons are awful people, and he's even more against them because they are "dirty
Loyalists." Curzon will eventually ask Isabel if she feels "beholden" to the
Locktons. Isabel says that she's just biding her time until she can find the lawyer that will
grant her the legal freedom originally promised to her; however, Curzon says that he might have
a quicker and more dependable solution for obtaining her freedom:

You might be better served if you placed your loyalty with us.

Isabel isn't immediately in support of doing anything for Curzon,
but she does ask who "us" is and what she could possibly do. Curzon explains that
Isabel is likely to hear things in the Lockton household. Isabel quickly understands that Curzon
is asking her to spy, and Isabel doesn't see any good coming of that. Curzon then explains that
Colonel Regan could help get Isabel's freedom paperwork straightened out as a reward for helping
the Patriots. Isabel likes the idea; however, she simply isn't willing to risk herself or Ruth
at this point in the novel.