The Rogue and the Runaway (Fallen Angels #4)
Robin, a retired spy, is restless on his brother's estate and not over distressing events in France. He encounters Maxie on the road and rather than whistling up a coach decides to accompany her in the persona of a footloose ne'er-do-well.
Of course it is the duty of a good English family to protect their young women, even the strange half-Indian ones, and when Maxie's aunt shows up for an unexpected visit she immediately joins in the hunt and tracks Maxie far enough to find out that she is travelling with a known rogue and harangue Robin's brother about it. Add a determined Bow Street Runner and realize that they're hunting a slippery Indian girl and an equally slippery British spy.
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