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

Newly arrived in 1892 New England, Abigail Rook becomes assistant to R. F. Jackaby, an investigator of the unexplained with the ability to see supernatural beings, and she helps him delve into a case of serial murder which, Jackaby is convinced, is due to a nonhuman creature.

In an attempt to understand why her best friend committed suicide, eighteen-year-old Cody Reynolds retraces her dead friend's footsteps and makes some startling discoveries.

"The Virals must find a geocache concealing a bomb--and the clock is ticking."--

Bad things don't happen to popular girls like Lizzie Lovett-- until her disappearance became the one fascinating mystery the sleepy town of Griffin Mills has ever had. Hawthorn is convinced she'll turn up at any moment, and comes up with her own theory for Lizzie's disappearance. A theory way too absurd to take seriously... at first. She decides to immerse herself in Lizzie's life, getting a job at the diner where Lizzie worked and hanging out with...

Seventeen-year-old Poppy stumbles into a secret workshop at the infamous Grosholtz Candle Factory and soon, a wax boy called Dud is helping her uncover an evil plot that threatens her hometown of Paraffin, Vermont.

Eighteen-year-old identical twins Alice and Rachel have always shared a very special bond, so when one is abducted the other uses their connection to try to locate her.

As a nearly full-fledged member of the Agency, the all-female detective unit based in Miss Scrimshaw's Academy for Girls, Mary Quinn, disguised as a poor apprentice builder, must brave the sinister underworld of Victorian London in order to unmask a murderer.

When one of their tightly-knit group mysteriously disappears, four high school girls find their friendship difficult to maintain when they begin receiving taunting messages from someone who seems to know everything about their past and present secrets.

When Jamie and Charlotte join the theater program at Oxford, accidents start anew, giving them no choice but to throw themselves into a cold case.