When an anonymous note threatens someone they love, twins Sadie and Saskia Dopple are thrust into a series of crimes that look suspiciously like something from the pages of a mystery novel.

The ragamuffin boys known as the Baker Street Irregulars help Sherlock Holmes solve the mysterious deaths of a family of circus tightrope walkers.

When a kangaroo court of Everafters, led by Judge Mad Hatter, tries Mr. Canis for his past crimes as the Big Bad Wolf, the Grimms seek evidence to save their friend, although Sabrina questions whether he should be saved.

Caring for Ivy's talking parrot while she is on vacation, Julie rapidly discovers that an old friend has been hiding secrets that might be causing strange occurrences at Ivy's house, in a tale inspired by the wild parrots of Telegraph Hill and the vegetarianism movement of the 1970s.

As the fairytale detectives race through the Book of Everafter searching for their baby brother, they encounter various characters including the Editor and his army of Revisers, who threaten the children with dire consequences if they continue to change the stories.

Twelve-year-old Rose sets out to prove her brother's innocence when he is accused of shooting a politician during a Wild West show performance in Louisville, Kentucky, in 1886.

When Sherry Baldwin hosts a makeover sleepover that causes horrible reactions in her friends' skin, she enlists the help of her mother, a ghost detective at the Academy of Spirits, to help solve the mystery of the tainted makeup.

In 1908, eleven-year-old Innie joins the library club at a settlement house that serves immigrant families of Boston's North End, but when items and money disappear from the settlement house, Innie's past as a troublemaker puts her under suspicion.

Caroline worries that British spies may be lurking in Sackets Harbor, but when strange things start happening at Abbott's Shipyard Caroline wonders if a spy, either someone she has known all her life or Papa's long-lost friend, is responsible.

After a dying criminal confesses that his loot has been stashed "in the tower," the Hardy boys make an astonishing discovery.