Charlotte, daughter of Reverend Percival Hatton, has been content to follow the path laid out for her. Charlotte has an understanding with Captain Nicolas Paget - every inch the gentleman - who she expects someday to marry. But then she meets Josiah Martyn, and everything changes... A driven and ambitious Cornish mining engineer, and the complete opposite to Captain Nicholas, Josiah has come to London to help build the first tunnel under the river Thames. When unpredictable events occur at the inauguration of the project, Josiah and Charlotte are suddenly thrown into an unexpected intimacy. But not everyone is happy with Charlotte and Josiah growing closer. As friends turn to foes, will they be able to rewrite the stars and find their happy ever after, although all odds seem to be stacked against them...?