Rosamund Lupton - Sister

This is a great book. It had me on the edge of my seat for the whole day that it took me to read it. I just could not put it down.
It would make an excellent reading group book, given the subject matter.
There are two sisters one lives in the US and is materially successful, the other goes to art school in London. Given the distance they are very close. Then the unthinkable happens Beatrice's younger sister Tess goes missing in London. The police give up, her fiance is desperate for her to return to the states, their mother gives up, but Beatrice does not give up, This is a story about how far would you go to find out what had happened to your sister. As Beatrice slowly unpicks her sister's life, she comes to know her better and this affacts all the relationashps in her life. It is very difficult to say more without spoilers.
I recently attended a book club where we discussed this book and a really lively discussion took place, so I really recommend it!