The Lake House, by Kate Morton

I adore Kate Morton.  Sadie Sparrow is a police detective in big trouble for leaking information about a botched investigation to the papers.  In exile in Cornwall, Sadie finds an old abandoned property and learns about the disappearance of a young boy decades earlier.  To prove herself (perhaps to herself), she begins to investigate the circumstances of the child's disappearance and follows the trail to his sister, a mystery writer named Alice Edevane.  Lots of secrets!!

The Secret Keeper, by Kate Morton

Kate Morton does history, love, and family with humor, insight, and suspense.  Laurel Nicholson is a very successful actress, who joins her siblings at the deathbed of their mother, Dorothy.  With the help of her brother, Gerald, she tries to get to the bottom of a violent episode she witnessed as a young teen. The violence stems from a period in Dorothy's life when she was an ambitious lady's maid and her friends Vivien and Jimmy fall in love while helping at a children's hospital in war torn London.