The Lake HouseKate Morton
Seventy years later, after a particularly troubling case, Detective Sadie Sparrow retreats to her beloved grandfather's cottage in Cornwall. Once there, she stumbles upon a long-abandoned house, and learns the story of a baby boy who disappeared without a trace.
Meanwhile, in her elegant Hampstead house, the formidable Alice Edevane now leads a life as neatly plotted as the bestselling detective novels she writes. Until a young police detective starts asking questions about her family's past, seeking to resurrect the complex tangle of secrets Alice has spent her life trying to escape.