Wait for You went on sale in late Feb. and hit the No. 1 spot on the Digital Book World Ebook Best-Seller list on March 10, a first for a self-published book.
Users can choose to pay from a list of pre-stored cards and shipping addresses kept securely in the digital wallet, removing the need to manually enter payment details as is necessary with most existing online payment systems.
But in the first quarter of 2013, Harlequin had a handful of hits on the best-seller list, indicating that it might be turning its digital performance around.