 Lily asks Herman a very simple task: go to the bank and withdraw all the money from her tax account. The bank managers are worried about a robbers disguised in a Halloween fashion. So, when Herman and Grandpa arrive to the bank, they re mistaken for robbers. The frightened cashier, without saying a word, gives them all the money in cash. Surprised, Herman and Granpa return home with a big sack of money. They count all the money and gives $18,300 dollars, much more than Lily expects. Angry because of Herman mistake, Lily explains him that the correct amount of money should have been $618 dollars. Then, Lily asks Herman to return the rest of the money to the bank. Herman sees his dreams of a rich man fly far away, he doesn t even sleep well that night and decides to go to the bank during the night to return the money with Grandpa. Of course, the bank s closed, but Grandpa manages to open the door and even the bank safe. But when they re inside of the bank safe the door closes accidentally and locks them inside. They try everything, even use a phone to call the police or somebody. Their salvation will be in a couple of crooks, which blow out the door without knowing the surprise that they ll find inside. Herman and Grandpa become a pair of involuntary heroes, that helped the police to put in jail the robbers.