The Signal has ideas of grandeur. It looks impressive, but the final third drains if of all momentum, ultimately ending flatly and frustratingly incomplete.
The only intrigue I found stemmed from waiting for things to kick off, which only lead to disappointment as it petered out.
Fishburne enjoys a mysterious role, whilst Thwaites follows on from his role in Son of a Gun; meaning it’s not a bad role, but he makes no impression.
A visual similarity to the much more effective Ex Machine doesn’t help matters. It’s great to see more sci-fi, but The Signal’s ambition exceeds its skill.