When will books benefit from the addition of multimedia magic? Narnia may hold the answer.

HarperCollins has released an enhanced e-book for C.S. Lewis's The Chronicles of Narnia: The Voyage of the Dawn Treader in advance of the film adaptation of the same. The book is a perfect test case for the promises and flaws of the enhanced e-book market.

The Voyage of the Dawn Treader isn't an app, but a multimedia EPUB book. EPUB is as close as we have to a universal e-book standard. This immediately makes it multi-platform and multi-device – no need for separate iOS or Android code, or store approval. All you need is an application on those platforms that can read EPUB, and a touchscreen. EPUB books can't be read on the Kindle, but the Kindle isn't a multimedia touchscreen device either, so that's no loss anyways.

The book is available for iBooks now, and according to the press release, "will be available on a number of handheld multimedia readers and touchscreen devices" – read: the forthcoming Nook Color, and possibly other Android tablets too. On all available platforms, it will cost $10.

Sometimes, enhancing e-books with multimedia seems like a solution in search of a problem. Generally, readers aren't clamoring for enhanced books. Writers and publishers don't always understand them, and there isn't always good content to put in them.

Lewis's Narnia books are different. They have a well-established readership and are broadly popular with both adults and children. They've already gone transmedia, spinning off games and movies; the writer's estate is willing to develop and authorize new media, and companies like HarperCollins and Disney have the tools and incentives to develop them. The serial nature of the books, in turn, gives the books continuity and room to evolve.

What's more, the visually rich and conceptually encyclopedic nature of the books means that adding maps, illustrations, animations, reference guides, and timelines actually become very useful reading aids. Add in audio readings and commentaries, critical essays, and you have something that could become the equivalent of a deluxe DVD edition of a beloved book.

Really, the deluxe DVD editions of The Lord of the Rings were enhanced e-books without us fully realizing it – at least those portions devoted to author JRR Tolkien, the writing of the books and the world of Middle Earth. That's the standard against which we should judge enhanced e-books.

The Voyage of the Dawn Treader doesn't quite get there. I reviewed the iBooks version, which costs $10, $2 more than the $8 "non-enhanced" version. It gets the Pauline Baynes maps and illustrations, animation and reference encyclopedia right. This material alone is worth the extra $2.

But a promising "read along" feature, using audio from Shakespearean actor/audiobook standout Derek Jacobi's reading of the book, is hopelessly crippled, providing just the first few paragraphs of each chapter. If you want to hear the whole thing, you'll need to buy the separate audiobook, which costs another $17 from iTunes. Putting snippets of audio in the e-book feels like a terrible tease.

Again and again, enhanced e-books bump up against rights that have already been sold and assigned. The video content, including an animated timeline/summary of the story, is solid, but considering the e-book is intended as a cross-promotion with the film, it's sad that it doesn't even include previews from the film.

It's a worthwhile object for what it is. But it's ultimately frustrating, because the potential for an integrated object on video-capable e-readers like the iPad and Nook Color is so clear, at least to me.

The publishing industry, though, is so knotted – the media streams so legally and functionally fragmented – that the opportunities for a clear case study, an example that everyone can point to as a standard, get squandered again and again.

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