When darkness falls and bedtime comes, Papa tucks Alex in, then puts on his hard hat and goes to work. Papa is an engineer who works at night. "Take me with you," Alex says. "Not tonight," says Papa. But one night Papa has a surprise -- a hard hat for Alex! He takes Alex with him to the construction site, where excavators rumble and cement mixers hum. As his dream comes true, Alex gets to be a night worker just like Papa. Kate Banks's evocative text and Georg Hallensleben's colorful paintings combine to make a unique bedtime book that will delight all children, especially those who are fascinated by big machines.