"When Kai's twin sister, Kishi, is stolen and killed by the legendary Ghost Whale, Kai sets out a long and dangerous adventure to bring her back to life"--

Twins Audrey and Clare grapple with their brother Adam's death as well as with the need to belong.

Returning home from a trip to Paris, Boston medical examiner Maura Isles confronts a nightmarish scene. Police cruisers line her street and slumped in a car at the end of Maura's driveway is a dead woman, her head bloodied by a gunshot wound. The dead woman looks exactly like Maura. Within a week, the DNA lab delivers a stunning verdict: the dead woman is Maura's twin. A twin she never knew she had.

Thirteen-year-old Mary Beth Mullet and her twin brother, Johnny, discover that someone has been spending time in the old barn Mary Beth escapes to when she needs time to herself.

In the early twentieth century in Swampsea, seventeen-year-old Briony, who can see the spirits that haunt the marshes around their town, feels responsible for her twin sister's horrible injury until a young man enters their lives and exposes secrets that even Briony does not know about.

Seventeen-year-old Payton Brave is desperate to uncover what happened to her twin sister, who disappeared one year ago. As she begins to question everything around her, Payton becomes caught in a mystery that goes deeper than she ever imagined.

As fourteen-year-old telepathic twins struggle to escape the clutches of the Nightrise Corporation, one of them travels through dreams to a time when the evil Old Ones ruled and learns the role that he, his brother, and three other Gatekeepers must play to keep the world safe from the Old Ones' return.

Book 3 in the Westward Chronicles. A case of identical twins and switched identities is at the heart of this dramatic and romantic Harvey House novel. At first the ruse is just fun and games, but when a local doctor becomes involved the gig is up.

Avoiding relationships to protect her sensitive heart, plus-sized Molly supports her once-cynical twin, Cassie, when the latter has her own bout of lovesickness, a situation that is complicated by sibling dynamics and an unexpected romantic triangle.