Scraps of Paper (Spookie Town Murder Mysteries, #1)

Abigail Sutton's beloved husband walks out one night, doesn't return, and two years later is found dead, a victim of a long ago crime. It's made her sympathetic to the missing and their families.
Starting her new life, Abigail moves to small town and buys a fixer-upper house left empty when old Edna Summers died. Once it was also home to Edna's younger sister, Emily, and her two children, Jenny and Christopher, who, people believe, drove away one night, thirty years ago, and just never came ...