Johannes Roberts directed (or co-directed) five films in this book. When Evil Calls is the last and, though it's narratively simple, it's structurally bizarre because it was originally made to be watched on mobile phones. So it's 20 two-minute vignettes, each one a variant on 'The Monkey's Paw', linked by a rambling monologue from Sean Pertwee.
Not unenjoyable if you know what you're getting. And with a great comic turn by Chris Barrie.