Sony Pictures has released a tie-in app for the Dark Tower series (shot in Cape Town) called Sombra Group – a reference to the Sombra Corporation from the book series (an insidious group that works in the name of the Crimson King in our world) and also released on July 19th (the number 19 a common occurrence in the series). By downloading the app, you can scan the cover of the latest Entertainment Weekly and find a hidden message: a Rose, one of the nexus of reality from the series.