Mathieu Bonello was sin-binned for an intentional knock-down but Northampton could not make any more inroads before the break - Geraghty shinned another three-point attempt as the half-time whistle was greeted by an eerie silence at Franklin's Garden.
Hook, once again struggling with the boot, should have slotted over a three-point attempt early in the second half but it was quickly forgotten as veteran wing Shane Williams, playing in the final World Cup match of his career, produced a moment of magic in the 49th minute.