Help looking for a book i started reading in 1974

[Karen]

I bought a paperback book at the airport in 1974. 75, or 76. I think is was a fantasy (at that time) romance about the seven sisters of the seven sister constellation. It started by two sisters talking about their father Atlas. Does anyone know how I can look for it. Searched the internet and I've run out of ideas. Can anyone help?

[Brenda]

Actually, I am not interested in fantasies. I prefer a good novel perhaps of historical or clean romance or a solid who-dun-it mystery. I do not like witchcraft or sci fi. So sorry. I might offer old time authors up such as Taylor Caldwell. Why must all the authors of late discussed here -be new authors? There are so many great classic books of the past, which have been completely ignored here.