The story of 'The Whisperer in Darkness' starts at the hills of Vermont, where a strange creatures appear and many of these bodies' creatures floating on the surface of rivers. Professor Albert William receives many reports about this but he doesn't ratify this story to travel later and investigate the truth of those creatures and find massive numbers of them he can't imagine.
Only a playful horror picture, where Call of Cthulhu was actually a great & largely successful experiment; but it still gets to the heart of why Lovecraft works.
The atmospherics are in place, and the filmmakers catch the essence of Lovecraft's expansive horror with efficiency. The film is entertaining without attaining greatness.
The effect doesn't quite come off, mainly because the images are too sharp and the editing and camera work too modern. But the movie is endearing anyway for its fanboy ardor.