During a visit to the Chicago Cubs' Wrigley field, cousins Mike and Kate investigate why someone has been tampering with the famous ivy vines growing on the outfield walls. Includes historical note.

Miri is eager to return to her beloved Mount Eskel after a year at the capital, but the king and queen ask her to first journey to a distant swamp and start her own miniature princess academy for three royal cousins, but once there she must solve a mystery before she can return home.

Twins Bradley and Brian are celebrating Mother's Day by treating their mom to a hypnotist's show. But when the Pinto family gets home from the show, the twins' mom starts acting strange. She splashes in the bathtub for hours, she leaves corn kernels all over - she even quacks! Bradley thinks his mom has been hypnotized into believing she's a duck! Can Bradley and Brian, with help from their friends Lucy and Nate, turn their mom back into their mom?...

When Stevie Bell is finally able to return to Ellingham Academy after identifying the culprit in the murder of a classmate, she begins to wonder if the case was really resolved and attempts to uncover the truth about the school's founder. Stevie Bell seemed to be on the cusp of the decades-old kidnapping and murder of Albert Ellingham's family. But a classmate's murder-- which Stevie solved-- convinced her parents to pull her out of Ellingham Academy....

Through the window of their hotel room in the Toronto Blue Jays baseball stadium, cousins Mike and Kate spot strange blue lights flashing across the bullpen and decide to investigate.

Dink, Josh, and Ruth Rose investigate the theft of a great deal of money from the belly of a nearly life-size Tyrannosaurus Rex model that their friend, Jud Wheat, is using to raise money for a dinosaur museum.

"The president's brother is a catcher on the Nationals baseball team, and someone is stealing his equipment! Can Mike and Kate help the commander in chief catch a criminal?"--

"Could the Mark Twain books hidden through Book Scavenger contain clues about the string of recent arson fires plaguing the city? And will Emily and James uncover the mystery before the arsonist comes after them?"--

Libby heard a noise in the barn. When she looked she saw two heads that were exactly alike. Could she risk helping the Brakie twins and when it might get her into trouble.

"Cassie Hobbes and the other members of the Naturals program of the FBI work to solve a string of serial murders carried out by a copycat killer"--Provided by publisher.