From the bestselling author of The Double Bind, Skeletons at the Feast, and Secrets of Eden, comes a riveting and dramatic ghost story. In a dusty corner of a basement in a rambling Victorian house in northern New Hampshire, a door has long been sealed shut with 39 six-inch-long carriage bolts. The home's new owners are Chip and Emily Linton and their twin ten-year-old daughters. Together they hope to rebuild their lives there after Chip, an airline...

Mad scientist Petty Potts asks her neighbors, twins Josh and Danny, to help with her experiments and when her SWITCH spray turns them into flies, they are able to investigate the sabotage of their mother's garden.

After accidentally drinking some of mad scientist Petty Pott's SWITCH potion while at school, twins Josh and Danny become grasshoppers and this time they may not change back without help.

When their sister, Jenny, is accidentally turned into a crane fly by Petty Potts' SWITCH spray, twins Josh and Danny must transform themselves, as well, and rescue her before she burns her legs off.

Twin brothers play ball with their dog Slim.

A mad heiress and a false fiancé... The younger son of an earl, Dominic Renbourne is offered an irresistible bribe by his arrogant, identical twin brother, Kyle, who is heir to the earldom. All he must do is take Kyle's place at Warfield Manor, where he is to politely court Lady Meriel Grahame, the orphaned and vastly wealthy heiress Kyle is pledged to marry. The deception need only take a few weeks and no one will be the wiser because the fey Lady...

During an unwelcome visit, neighbor Tarquin unwittingly uses SWITCH spray to turn twins Josh and Danny into ants, then sets out with a magnifying glass to fry some bugs.

One had a secret. One lost her mind. One died. After the tragic death of her twin sister and a subsequent breakdown, Abi has moved to Bath to make a fresh start. But wherever she goes, she's haunted by the memory of Lucy, and can't stop herself from searching fruitlessly for her sister's face in crowds. One day she meets Bea - a girl with an uncanny resemblance to Lucy - and Bea's twin brother, Ben, with whom she feels an irresistible attraction....

When a new girl in the Barkers' class, Carole Anne, acts like a bully, the students try talking to her and ignoring her until Morgie finally discovers what is wrong and finds a way to fix it.