 The bank vault is found robbed but not tampered with, the Watchman dead inside, and only Banker John Cameron knew the combination. Clint Bradford looks for the answer and finds it in two brothers who share a room over the bank. As part time surveyors they have a transit which when placed through a hole in the floor can read the numbers on the vault lock. But now Clint must find a way to prove it as Cameron s trial for the murder of the Watchman is underway.