In the year 241, twelve-year-old Lina trades jobs on Assignment Day to be a Messenger to run to new places in her decaying but beloved city, perhaps even to glimpse Unknown Regions.

When Amelia Bedelia and her friends at school explore different jobs, Amelia's literal-mindedness causes some silly misunderstandings.

When Mallory cannot decide what to be on Career Day, it makes her feel like she is not good at anything and she ends up telling a lie that quickly gets out of control.

When Charlie exaggerates about his dad's career and convinces his classmates that his dad would be the greatest Career Week speaker ever, what will happen if his dad actually does come and his friends find out the truth? When his classmates are boasting about their parents' jobs, Charlie gets carried away and leaves the impression that his accountant dad is not only the president of his company but also that he will hand out free calculators to everyone....