ciphers

When a new book arrives at the library with a secret code written inside, Derek, with the help of his friends, follows the clues from one novel to the next and makes a discovery that may help him get past a terrible loss.

"Thirteen-year-old Dan Cahill and his older sister, Amy, are running out of time. An exiled Cahill known as the Outcast has already recreated three of history's worst disasters, and he's saved the worst for last. If Dan and Amy can't find and stop the Outcast fast, he will initiate a full-scale nuclear meltdown. But as Dan and Amy race around the world, they discover something horrifying. The Outcast's disasters are only a smokescreen to cover up his true plan, a diabolical revenge on the family that betrayed him. Soon Amy and Dan will have to confront a hard truth: Sometimes the only way to save the world is to sacrifice everything you love"--Back cover.

"One girl must unlock the secrets within Paradise Lost to save her father's life"--Provided by publisher.

"When a ghostly foe begins stealing from the highest buildings in Twinford, Ruby Redfort is ready to defy death one more time to capture the bandit"--OCLC.

When Leo's flighty sister Paris leaves her at the Heartbreak Hotel Diner in Las Vegas with a cryptic note, Leo sets out in search of Paris with the help of a physics student named Max.

Seventeen-year-old Ian Kabra, who is the head of the powerful Cahill family, is challenged by a Cahill from the past who calls himself the Outcast to stop him from recreating four of history's greatest disasters and hopes he can find Amy and Dan so they can help him decipher the hints in time to save innocent lives.

While on vacation with their parents in Cornwall, twins Danny and Josh follow clues to another marble but find themselves trapped by the tide on a rocky island and the only way back is to use some pilfered REPTOSWITCH.

Dunkum follows a trail of secret coded messages to find his missing autographed basketball.

During World War II, eleven-year-old Felicity is sent from London to Bottlebay, Maine, to live with her grandmother, aunt, uncle, and a reclusive boy who helps her decode mysterious letters that contain the truth about her missing parents.