Promotion begins at October 31st, 2019 at 12:00pm ET and ends June 29th, 2020 at 11:59pm ET. Offer only available to retail consumers in the United States age 18 and older as of October 31st, 2019. No refunds, exchanges, or substitutions. Offer limited to one per email address. You must pre-order a copy of THE EMPIRE OF GOLD hardcover book (9780062678164) or ebook (9780062678188) (published by HarperCollins Publishers) to take advantage of this offer. HarperCollins Publishers reserves the right to request a copy of original store pre-order receipt or copy of email pre-order confirmation to validate pre-order. If pre-order cannot be verified, offer will be void or subject to revocation. Theft, diversion, reproduction, transfer, sale or purchase of proofs-of-purchase or receipts or coupons is prohibited and may constitute fraud and could result in prosecution. Not responsible for lost or damaged pre-order receipts or coupons. Void where prohibited, taxed or restricted by law.