A lady's secret - Jo Beverley

When Robin Fitzvitry, the fun-loving Earl of Huntersdown, encounters a cursing nun in a French inn, he can't resist the mystery. He offers to help Sister Immaculata reach England, expecting amusement on the tedious journey home from Versailles.

Petre d'Avernio is not exactly a nun, though she has spent years in an Italian convent with her mother, whose death has left her in danger. She must find the only person who might protect her-her true father, an English lord who does not know she exists. The gorgeous earl Robin Fitzvitry will be a dangerous ally, but she's glimpsed her pursuers and must race to the coast. She will resist him, use him, and eventually escape him with her virtue and secrets intact-she hopes.