“There are obvious downsides to releasing a book exclusively as an app. ‘I’ll Take You There’ won’t be available in bookstores or even from e-book retailers like Amazon or Barnes & Noble when it comes out next spring. Instead, Mr. Lamb’s fans will have to buy it from the iTunes app store, and it will work only on Apple devices. Mr. Lamb said that as a music and film lover, he was excited by the prospect of enhancing a narrative with music, film clips and video.”