It's the summer of 1983, and one by one, the kids of Far Flung Falls are disappearing.

With sheer drop-offs at every turn, the woods behind Molly McQuirter's house have always been a dangerous place--even before something big and metal started lurking in them. But when Molly's little brother is snatched up before her eyes, she has no choice but to follow. Sure, Wally tends to ruin everything, and his finger practically lives up his nose, but she isn't about to let him be abducted by some unknown enemy, especially since their mom ran off to Florida two years ago and their dad, who's slowly morphing into a couch potato, won't be any help. If Molly wants to protect the family she has left, Wally's rescue is going to be up to her. So, aided a crew of unusually determined pets, Molly sets off on Pink Lightning--her tricked-out bicycle--on a chase through the hills of southern Ohio.

Finding the robot culprit only creates more questions, however, and when the unlikely mastermind behind the robot is uncovered, a new story begins to unfold--one of lost love, family bonds, and some seriously weird science.