Thirteen-year-old Ruby, a genius code-cracker and daring detective, gets an anonymous call setting a challenge that leads her to the headquarters of Spectrum, a highly secret anti-crime agency that needs her help to crack a code, but soon Ruby uncovers dastardly plans of the Fool's Gold Gang.

Amy and Dan cross the oceans on the trail of a famous aviator, but they find more than they're looking for. Their enemies are becoming more vicious, and the truths they discover more crushing than ever.

Using their code-breaking skills, four middle-schoolers solve the mystery of the eccentric man who draws stick figures on his second-floor bedroom window.

Never trust a fae. Lark Mairen knows this. In her village, the border between the fae and human worlds is as thin as a whisper, and fae trickery is nothing new.But Lark's brother, Galin, has just disappeared into the fae realm while racing in the deadly Wild Hunt, and Lark's only lead is a mysterious fae boy called Rook. To save her brother, she'll have to trust Rook--even if it takes her into the dangerous fae kingdom, where she'll untangle riddles,...

"A strange telegram lures fourteen-year-old Amy Cahill and her younger brother, Dan, deep into Russia and away from the only trustworthy adult they know. Signed with the initials NRR, the telegram launches a race to uncover a treasure stolen by the Nazis and the truth behind the murder of the last Russian royal family. All too soon, the treasure hunt starts to smell like a Lucian trap. But the bait might just be irresistible--what will Amy and Dan...

In the midst of a series of unexplained accidents and mysterious coincidences, sixth-graders Calder, Petra, and Tommy lead their classmates in an attempt to keep Frank Lloyd Wright's famous Robie House from being demolished.

"On their first night in Paris, the Gamaches gather as a family for a bistro dinner with Armand's godfather, the billionaire Stephen Horowitz. Walking home together after the meal, they watch in horror as Stephen is knocked down and critically injured in what Gamache knows is no accident, but a deliberate attempt on the elderly man's life. When a strange key is found in Stephen's possession it sends Armand, his wife Reine-Marie, and his former second-in-command...

Eva Traube Abrams, a semi-retired librarian in Florida, is shelving books one morning when her eyes lock on a photograph in a magazine lying open nearby. She freezes; it's an image of a book she hasn't seen in sixty-five years--a book she recognizes as The Book of Lost Names. The accompanying article discusses the looting of libraries by the Nazis across Europe during World War II--an experience Eva remembers well--and the search to reunite people...

Twelve-year-olds Ambrose, Tom, and Frankie are transported to the boys' hometown of Freedom Falls, Ohio, in 1852 when Frankie blows her Romani family's magical trombone, and to return home they will have to use both Morse code and the ancient form of divination known as the I-Ching.

"Jacobite exile Mary Dundas is filled with longing--for freedom, for adventure, for the family she lost. When fate opens the door, Mary dares to set her foot on a path far more surprising and dangerous than she ever could have dreamed. As Mary's gripping tale of rebellion and betrayal is revealed to amateur codebreaker Sara Thomas, she faces events in her own life that require letting go of everything she thought she knew--about herself, about loyalty,...