COBALT ON A RAINY DAY is one of only two books that I have ever purchased due solely to the title. The other was I AM THE ONLY RUNNING FOOTMAN by Martha Grimes, and I concluded that the title was the very best thing about that one. But not so with COBALT. I was very pleasantly intrigued from the outset, where the author discloses the origin of such a beckoning title in her acknowledgements. As the story unfolded, after a mysterious prologue, I found myself to be deeply interested--emotionally invested--in the developing romantic relationship between the two women, "Mattie" and "Angela". The entire tale was so true-to-life that it was difficult for me to believe that I was reading fiction. The things the characters say and do in this novel are the things that REAL people say and do. I very much recommend this book, and I think it would make an excellent movie--Think MULHOLLAND DRIVE without the creepiness.
I give it 4 stars out of 5, and refer you to Amazon.com for more information, as I cannot find it here on Goodreads.