It shall be the duty of the Committee to investigate the financial affairs of the town, including receipts of and expenditures by the different departments, or any Town Officer; the methods in which the town business is conducted; the general conduct of the town affairs; and all the articles in town warrants for town meetings referred to it; and, in the discharge of its duties, shall have free access to all books of accounts, books of record and all accounts, bills, and vouchers on which money has been or may be paid from the town treasury.