I received an ARC of this book from NetGalley in exchange for my unbiased opinion. 
 Lux is a single mom in 1970s San Francisco. When her son, Benno, flies to Rhode Island to spend a couple of weeks with his grandma, she decides to go camping in Valley of the Moon. In the middle of the night, she wakes up to a dense fog, and walking through it, finds herself transported to 1906 at Greengage Farm. Joseph Bell and the rest of the residents of Greengage Farm awoke early the morning of April 18, 1906 to the worst earthquake they had ever experienced. Miraculously, there is no damage to their farm; however, the farm is surrounded by a thick fog that kills anyone who tries to walk through it. They are trapped, isolated on their farm, until Lux comes through the fog 4 months later, claiming to be from the future. Lux is quickly enamored with Greengage, feeling more at peace there than she does in her real life. Lux and Joseph hypothesize that the fog only shows up in the "present" during the night of the full moon, and Lux returns every full moon to try to visit Greengage, balancing it with her life in 1970s San Francisco. Some months the fog is there, and she visits Greengage for as much time as she can spare, and some months she has to go home and wait until she can try again. She soon finds herself torn, her heart both with Greengage and her life in the present. 
 This was an engrossing, entertaining, unique story. Who wouldn't love to have the ability to travel back in time and return to the present? I completely empathized with Lux's dilemma and wished she could find a way to have it all. This is the first book in a while that has made me cry, although the overall tone of the book is not sad. This is the first book I have read by Melanie Gideon, and it makes me want to check out more of her books.