The Au Pair by Emma Rous

This tells the story of the well-to-do Summerbourne family. Twenty-five year old twins Seraphine and Danny have lost both parents. After finding a baby picture with only one baby in it, Seraphine starts to wonder if the gossip and rumours she's heard in the village over the years are actually true. This leads her to track down a former au pair, Laura, who lived at the Summerbourne Norfolk estate and looked after the twins elder brother Edwin around the time of their birth. The chapters alternate between Seraphine's story, set in the present day, and Laura's story set back in 1992.

There were times when I wondered if the author really needed 400 pages to tell a fairly straight forward story, but the second half of the book opened up more questions and I really enjoyed the last 100 pages. There were plot twists that didn't seem particularly credible, and some of the characters weren't well-developed, but overall the book was a good holiday read.