Kidnapped! Naruto's Hot Springs Adventure!

On their way back to Konoha, Naruto, Tsunade, Jiraiya, and Shizune stop at a town with hot springs. Unbeknownst to them, they are being watched by two men looking for Tsunade. While in the hot springs, Naruto's room gets raided and the necklace Tsunade gave him is missing. Naruto finds a note and follows the directions on it to a hill outside of town where he meets the two men from earlier. They reveal to Naruto that Tsunade owes their family money and they have come to retrieve it from her. When they pretend to kidnap Naruto to get the money, they fail and end up having Naruto steal Tsunade's bag. Shizune gives chase, but can she stop them? What is so important about Tsunade's bag?