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.

While visiting Chicago, twins Ashley and Bryce catch up with old friends, visit the house where they grew up, see many reminders of their deceased father, and help search for their best friends' uncle, who disappeared days before his wedding.

On a cold winter day in Chicago, Early's father disappeared, and now she, her mother and her brother have been forced to flee their apartment and join the ranks of the homeless--and it is up to Early to hold her family together and solve the mystery surrounding her father.

Theo is brokenhearted when he accidentally lets go of the string of his party balloon. As he watches it float out of sight, Theo wonders where his balloon might have gone. Luckily, his older brother Zeke knows everything about everything. Zeke explains that it is a little-known fact that all lost balloons end up in Chicago, the Windy City. Then he tells Theo about Frank, who is responsible for collecting all the balloons in the world. Theo is so touched...

When thirteen high-value pieces of art are stolen from a secret museum, Calder, Petra, and Tommy are grouped with two new companions to solve puzzles that are complicated by the clever Mrs. Sharpe.

"Ben Tajima spots a ghostly boy all over town during a visit with his grandparents to Chicago, Illinois"--

CeCe Jones and Rocky Blue, best friends, neighbors, and background dancers for the hit television show, "Shake It Up, Chicago," compete in a dance marathon for charity and work with the competitors at the Little Cutie Queen beauty pageant.

"Haunted after helping her father on his ghost-themed Chicago bus tour, twelve-year-old Claire must discover what the spectral boy from the bus wants before it is too late"--Title verso page.