TL;DR: Save 80% on a lifetime subscription to Headway, an app that summarises books into 15-minute summaries. Get this app on sale for £47.06 (reg. £235.30) at the Mashable Shop. Is reading trendy?

I also found that the summaries on the back of a book often didn't jive with what I remembered of what I read, so I wanted someplace I could keep track of my ideas about a certain book or book series.