Kindle's in-book AI assistant can answer all your questions without spoilers

If you're several chapters into a novel and forgot who a character was, Amazon is hoping its new Kindle feature will jog your memory without ever having to put the e-reader down. This feature, called Ask this Book, was announced during Amazon's hardware event in September, but is finally available for US users on the Kindle iOS app.

According to Amazon, the feature can currently be found on thousands of English best-selling Kindle titles and "only reveals information up to your current reading position" for spoiler-free responses. To use it, you can highlight a passage in any book you've bought or borrowed and ask it questions about plot, characters or other crucial details, and the AI assistant will offer "immediate, contextual, spoiler-free information." You'll even be able to ask follow-up questions for more detail.

While Ask this Book may be helpful to some Kindle ...