A spy for the Government Investigation Bureau, twelve-year-old Zac is sent to Great Icy Pole to learn why planes are suddenly making frequent flights over a remote research station.

"What happened?" I asked, leaning against a folding chair as I tried to catch my breath. Julia glanced up at me coolly, and then reached for a box I hadn't noticed on the other side of the table. "Well, we received a disturbing package," she said. The box was about a foot square. Carefully angling it away from Carrie, Julia cracked the top of the box open. When I saw what was inside, my stomach roiled and I had to look away. Who would send something...

Devin has to figure out who is trying to sabotage her team before the Kicks' championship hopes disappear for good.

Nancy Drew and the Clue Crew investigate when circus acts are sabotaged. When the circus comes to River Heights, Nancy and the Clue Crew investigate who is stealing some very important props from the performers.

Frank and Joe investigate sabotage on the set of a pirate-themed reality television show.

Stella North is one of twelve young pilots competing in a 1937 air race meant to promote peace in Europe, but when one of her competitors is sabotaged, Stella races to determine who is capable of murder, and who might be the next victim.

Nancy Drew and her friends investigate when strange things start happening at a local theater, rumored to be haunted, during auditions for a televised talent show.

Frank and Joe bring their detective skills to the athletic arena in this all-new Hardy Boys Secret Files mystery!It's time for Field Day at Bayport Elementary and all the kids are excited! Whatever grade wins gets a pizza party, and the person with the highest personal score also gets a special prize. But when the field equipment is sabotaged the day before the events are supposed to start, it looks like Field Day might not happen after all--unless...

Brie and the rest of the dancers at Ms. Marianne's Academy of Dance are on their way to Florida to compete in the Citrus Jam which is held just outside of Orlando, and where first place includes the opportunity to march in the Main Street Parade at Disney World--but the team from Austin, Texas, includes some girls who are planning to sabotage the other competitors.