The blurb for "Third"

The blurb for "Third":

Helen Franklin is horrified when her dying father leaves her a most unusual inheritance: a woman. Furthermore, the woman, Anne, is anything but ordinary. Helen tells herself she does not have time for Anne. Yalia, Helen's wife, has been distancing herself from Helen for three years, and Helen needs to decide if she wants to save their marriage.

Then the unexpected happens; a romantic relationship develops among Yalia, Anne and Helen. Can the three of them figure out their lives together, especially when time might be running out for Anne?