I was lucky enough to pick up an ARC of this three days ago. Every free moment has been devoted to reading it since. 
 I should say something as a word of warning. While many authors that started out in YA fiction have been making the jump to adult literature recently, many of their books could still be read by their teen fans. This is NOT one of those books. In fact I doubt it appeals to many people under 30. I find it highly unlikely that they would get it (as evidenced by the some of the other reviews posted here, particularly the people that like Hopkins' other books). Nevermind the fact that it has some pretty explicit sex scenes. 
 This novel is nothing short of gorgeous. It's rich, dark, erotic, emotional, and in the end, heart-wrenching. But it is none of these things any moreso than real life can be. It is not over-dramatized, over-fictionalized. Instead Hopkins goes for utterly believable and honest to a fault, raw emotion dripping off each page. 
 Triangles is a sliver sliced out of the lives of three middle-aged women, their lives circling every kind of love and uncertain in each of them. All three of them parents, all of their children with their own problems and their own amazing wisdoms. They are also lovers, to a number of people, and finally coming to a point in their lives where they understand what that role means. Each of them is flawed, each of them makes her share of mistakes. And in their mistakes we see our own, those committed or only imagined. 
 Each woman has also reached a point of evaluation in her life where she looks around and wonders if this is all there is to life. When you've reached that point in your own life, pick this book up.