Old Bones Can Be Murder: A Charlie Parker Mystery Series, Book 18.5

A cryptic message in a fortune cookie sends Charlie again to England, to visit her favorite aunt. She's having lunch in a local café when construction workers come upon a human skeleton behind a wall. The police are called to a more urgent case, so Charlie begins sleuthing around on a cold-case crime website, only to discover Aunt Louisa was one of those questioned when the victim disappeared. Can she save her aunt from arrest, or will the real killer come after them both?