Hidden movement is the most under-used mechanic in all of board gaming. You can count the quality titles that use it on the fingers of one hand. Fury of Dracula, Letters from Whitechapel, Scotland Yard, Nuns on the Run and that’s about your lot.
Specter Ops still does’t take us on to the second hand. But it expands the genre with a style and energy that has to be played to be appreciated.