The pistol was made by Thomas' friend and inventor, Dr. Hugo (something), the Swiss Clock maker.
The pistol is a gas-propelled and fires a steel hook with spring-loaded prongs. A sliding scale on the side of the pistol dictates the amount of gas used and how far the hook will go a maximum of 50 feet.
The spool is detachable and can be clipped to Thomas' belt so he can swing on the braided silk cord. The small gas canister must be replaced after 1 shot at maximum range.
Dr. Hugo made this for Thomas after hearing that he was trapped on a building's ledge and some thugs were trying to kill him. Thomas carries the Hook Pistol in an outer, side pocket on his Utility Bag (tm).
