It has been a peaceful three months since Hannah Morgan and Ever Barnes saved their beloved city and activated the incredible powers of its mechanical protector. Ever is finally living safely with the Morgan family, and the two friends spend their days watching over the city's giant mechanical guardian. But their quiet days crash to a halt when Mr. Morgan is suddenly captured during a family trip to the neighboring city of Alexios. To make matters worse, Hannah and Ever find themselves tangled up in a feud with a pair of tricky street magicians who steal Hannah's pocket money. These young magicians were never planning to make friends, but Hannah and Ever soon discover the tricksters have a dangerous connection to a notorious assassin. Realizing there is far more at stake than a few stolen coins, the group must learn to trust each other. If Hannah and Ever want to uncover a dangerous conspiracy and save both cities before time runs out, they will need to find a way to work together.