The Seven Sisters is the first of a series of seven books and so far just the first two have been published.
I've read other books by this author and like her style, there's always a mystery element involved. In this book we are introduced to the first sister who is adopted by a very wealthy man who lives in a mansion on the shores of Lake Geneva. In his younger days he did a lot of travelling and several times on his travels he returned with an adopted young daughter. All of them are named after certain stars.
Book 1 starts with the death of Pa Salt, as he is called by his daughters, although some mystery shrouds this event, his daughters are recalled from wherever they are in the world to attend his funeral.
The girls know nothing of their earlier backgrounds and certain clues are left to help them discover it, if they choose to. Maia, the eldest sister is curious about her origins and the book is devoted to her uncovering her story.
I'm looking forward to reading the next book The Storm Sister.