The Forgotten, by David Baldacci (adult fiction, Overdrive ebook). After he receives a posthumous note from his aunt hinting that things are horribly amiss in her Florida Gulf Coast town, Army Special Agent John Puller uncovers a shocking conspiracy.
"The Other Woman's House" by Sophie Hannah -- "Gripping British psychological thriller from a very witty author. If you enjoy Rosamund Lupton, I think you’ll like Sophie Hannah too." -- Melissa at the Service Center