Missing by E.A. Jackson

In 1990, amid a heatwave in London, DI Martha Allen is in charge of the investigation into the disappearance of five-month-old Bella Carpenter. Bella and her parents--Viv and Tom--are visiting from Wells and staying at a local hotel where Bella was taken from the room as her parents slept. With two distraught parents and intense media coverage, no one is more surprised than Martha when Bella is dropped off at the police station by a woman named Nell Beatty. Even though Bella is back with her family and Martha is told to drop the case, she has lingering questions about the situation. Now, thirty years later, Martha gets word that Nell Beatty has died and decides once more to investigate Bella's kidnapping. With a tense, almost claustrophobic setting, Missing is a book that's hard to put down. A great read-alike for Nicci French's Frieda Klein series.