When we got home, I plugged the Sony into the computer and deleted the library books. That seems to have fixed it. I read one of the books last night on the Sony 950 without a problem. Well, one of a bundle -- a "One-Click Harlequin Blaze," where you seem to get a month's worth of that line. There are six books altogether.
Later: I discovered Harlequin Extras the other day, while looking to see if Harlequin had free reads on their site. They have some online. I read The Cowboy Next Door, by Linda Warren. It's an extra off a Superromance series.
I looked up the books that were related to the book I read, which turns out to be the third in a series. Once a Rebel, by Debbie Rawlins, follows Once an Outlaw and Once a Gambler. They're also available as One-Click bundles in the library e-books, and Once a Gambler is available as a Google e-book, though I think I'll try to get it from the library first.
I looked up Mary Renault's books, too. Someone on AE had mentioned The Charioteer being a favorite book. The library has eleven of her books, including The Charioteer. I read that some time ago. Most of the others are set in ancient Greece.