Sarah's been taken hostage group of unknown soldiers, and before she can identify what side they're on, the house they were hiding out in gets attacked! The soldiers decide they'll make a run for it, but not before deciding where their prisoner's loyalties lie. If Sarah answers correctly, she'll be spared. If not, she'll be left to die in the burning house.
I feel like if Liberty's Kids wasn't aimed at a younger audience, Sarah would have run into a lot more trouble in the colonies.