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On Valentine's Day twin detectives Kate and Mickey investigate a case involving a vanished garnet pin and a maestro of classical music.

Giselle and Ingrid are the twin daughters of Doctor Victor Frankenstein, but they are very different people, and when they inherit his castle in the Orkney Islands, Giselle dreams of holding parties and inviting society--but Ingrid is fascinated by her father's forbidden experiments.

Ava and Lexi, high school seniors and identical twins, created an imaginary triplet, Alicia, to date and dump boys but now they are being stalked and impersonated by the sister they invented and their former dates are turning up dead.

Having secretly killed the boy who violated her sister, Joy finds herself pursued by a calculating blackmailer who threatens to expose her unless she reveals scandalous secrets and meets other escalating demands.

Twins Elizabeth and Katherine, attending the wedding of their father's cousin at Vandermeer Manor in Rhode Island, decide to investigate when someone vandalizes something precious at the manor.

Dee returns to her small hometown in New Jersey to see if she can help her father and the local police find her missing twin sister Beth, who was a leader in fighting the threat of a pipeline gutting the pinelands, but only finds more mysterious questions while disocovering signs of the supernatural in the surrounding woods.

When professional typist Letitia Glover is desperate to learn more about the fate of her twin sister Flossie, Enola enlists the help of her brother Sherlock and her friend Tewky to investigate Flossie's husband, the sudden death of his first wife, and the mysterious appearance of a black barouche.

"[O]ne girl desperately searches to find out what happened to her missing sister.