World's Worst Time Machine: Treasure in the White City Volume 2 - Dustin Brady - Bog

"Legend says that an eccentric millionaire hid a treasure somewhere inside the legendary 'White City' at the 1893 World's Fair in Chicago. Elsa and Liam have reason to believe that treasure holds the key to finding Elsa's grandfather who disappeared mysteriously over a year ago. The kids decide to break out the duct tape and twist ties to reassemble the World's Worst Time Machine. They're on the hunt! Liam and Elsa are not the only time travellers after the treasure. Not even close. If they're going to survive long enough to untangle the secrets of the White City, they'll need to upgrade their technology, make a few new friends, and rely on each other like never before. Oh, also, they're going to need a LOT of pickles"--