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Emma is shocked to learn she has a twin sister, Sutton, but on the day the girls are supposed to meet, Sutton is killed, and Emma risks everything to slip into her twin's life and try to bring the killer to justice.

Twins Maggie and Jennifer travel with their friend Sam, his father, and their grandmother to Mexico, where they uncover a homicide involving gun runners and CIA agents and Jennifer has to use her ability to become invisible to investigate.

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.

The Vickery twins, Lee and Felix, live in a house in Poplar Wood, where, because of the "Agreement," their mother serves Memory, and their father assists Death, and only Lee is allowed to leave the house, except for Halloween; but when a local girl is murdered, Gretchen Whipple, daughter of the mayor, offers the boys a deal--help her solve the crime and she will help them break the Agreement, and regain their freedom.

Queenie is a cat, deeply aware of her own perfection, and Arthur is a dog who normally likes everyone (except Queenie who is devoted to making his life a misery), and they both live at the Blackberry Hill Inn in the Northeast in snow country with their human twins (Harmony and Bro), and Mom; but one winter's day an unpleasant and suspicious stranger comes to stay at the inn, and soon the twin's uncle is framed for murder--and Queenie and Arthur must put aside their differences and work together to solve the mystery and protect their humans.

While true-crime aficionado Ellery and her twin brother are staying with their grandmother in a Vermont community known for murder, a new friend goes missing and Ellery may be next.