Gardner, Lisa. Frankie Elkin series #4

"A novel"--Jacket

"Recent Afghan refugee Sabera Ahmadi was last seen exiting her place of work three weeks ago. The local police have yet to open a case, while her older, domineering husband seems unconcerned. Sabera's closest friend, however, is convinced Sabera would never willingly leave her three-year-old daughter. At her insistence, missing personsexpert Frankie Elkin agrees to take up the search through the broiling streets of Tucson--just in time for a video of the young mother to surface, showing her walking away from the scene of a brutal double murder. Frankie quickly realizes there's much more to the Ahmadifamily than meets the eye. The father Isaad is a brilliant mathematician, Sabera a gifted linguist, and their little girl Zahra ... hasan uncanny ability to remember anything she sees. Which given everything that has happened during the girl's short life, may be a terrible curse"--

Series numeration from goodreads.com