A historical series about an unusual lesbian couple and their paranormal cases

On the passage to America, Eliza tries to find out more about their mysterious mission and her strange boss. The more she questions, the more questions she has. But when she finally finds Kathleen completely nude on the upper deck, her questions quickly give way to very different throughts: Did she really feel drawn to the author like this? Was she ready to leave her clothes, as well as her inhibitions? And how would Kathleen treat her when they would finally give in to their lust?