The absence of rats in the bank's underground levels as well as the sound of faint pickaxing compels Lt. Fitch to order that the vault doors be opened to see if the bank was being compromised. However, there are three bank agents each with a separate key to the vault and one of the keyholders has gone away on holiday.
Lt. Fitch decides to check if the vault is compromised by opening it due to the absence of rats in the bank's underground levels and the distant sound of pickaxes. However, there are three bank agents with different keys to the vault, and one has taken a holiday.