Versu is an interactive storytelling app from Linden Lab. There are currently four titles to play through. From the site:
The engine uses social AI by Richard Evans (Black and White, Sims 3) and conversation modeling by Emily Short (Galatea, Alabaster) to allow characters to react in-persona to whatever situations they encounter — so when you select an action, those around you will respond dynamically based on their moods, character abilities, and the narrative situation.
The 39 Steps is a digital adaptation of a thriller novel of the same name. From the site:
John Buchan’s incredible espionage thriller is our debut – and the first ever – digital adaptation: a new form of interactive entertainment that merges literature, cinema and gaming. Whether you know The Thirty-Nine Steps inside out, or have never heard of Richard Hannay, this is the classic story as it has never been told before.
Little Dead Riding Hood is a dark retelling of the classic tale.
Is this the future of storytelling? Are books going to become more like games? Or is it just a fad? 
* This post was originally published at Bibliomancy and was reprinted here with permission.