Now You Don't

Detective Cal Dempsey has spent twenty years building walls between her work and her life. At forty-eight, she's never been in a relationship, never let anyone past her defenses, never been anything but the job. Then crime scene photographer Mara Snowden-the police chief's niece and a fixture at crime scenes for years-disappears without explanation.

Left behind: a single photograph of a murder victim with three words written on the back in Mara's handwriting: For U Callisto.

Callisto is a nam...