Ellery Queen: Don't Look Behind You (1971)

Attorney turned therapist Hailey Dean is pulled into another investigation when a popular new dating app links multiple missing persons cases from around the city. Reuniting with her old team, Hailey discovers the potential dangers of online interaction, and must track down a killer before anyone else gets hurt.

When a college student is found dead, English professor Amy uses her crime fiction expertise to unravel the case faster than detective Travis, who ends up working with Amy to catch the killer.

A matriarch is poisoned during a family wedding reception and Aurora Teagarden vows to get to the bottom of the crime, especially when her mother, a friend of the dead woman, stands to inherit the bulk of the massive estate. 11th installment in Aurora Teagarden Mysteries.

When an old friend of New York Sentinel Crosswords editor Tess Harper is found murdered on the very day her puzzle includes his proposal of marriage, Tess unofficially teams up with Detective Logan O’Connor to find the killer.

Jennifer Shannon can always find a diamond in the rough, when it comes to garage sales, that is. Whether it's a new antique to sell at her consignment shop, an Atari game for her son or a piece of furniture for her handy husband Jason to refurbish, she has made a career out of her treasure hunting prowess. When a string of burglaries hits her town, Jennifer's keen eye for detail and her natural problem solving instincts even help her see the connection between these burglaries and local garage sales! Jennifer works with Detective Adam Iverson to investigate her theory that the perpetrators of the burglaries are fellow garage sale regulars. The case escalates to dangerous levels when Jennifer discovers the dead body of her friend. Even though the deceased's husband, Ben Douglas, finds nothing missing in their house, and the police label the death as accidental, Jennifer suspects that the death may be related to the burglaries.

Aurora's high school reunion turns deadly when a body is found in the hotel pool. Aurora and her Real Murders Club help investigate which classmate was most likely to kill.

A librarian with a sharp mind for murder, Aurora Teagarden is known around her small town as a master sleuth. When her friend Jane unexpectedly dies and leaves Aurora everything in her will, she also leaves a troubling murder mystery haunting her neighborhood. It is up to Aurora to piece together the clues—including a skull, its missing skeleton and a suspicious group of neighbors—and solve the murder before she becomes the unlikely killer’s next victim.

During a murder hunt game at a country house, to which Hercule Poirot is invited as an "expert", a real murder occurs.

During her birthday celebration, Tess and Logan find themselves swept up in a world that isn't always what it seems when the headlining magician at the Magic Manor winds up dead.

At the insistence of Ruth Van Rydock, an old schoolfriend who is convinced that there is something wrong, Miss Marple agrees to visit 'Stonygates', the country house of Ruth's sister.