And as the mystery deepens, we learn more about the characters.
The Sun
The mystery deepens as they uncover family tensions and loads of motives.
The Sun
The mystery deepens further, though, because polar clams, scallops, oysters and snails are the complete opposite: they are unusually small.
Times, Sunday Times
The mystery deepens when they witness the apparent abduction of another man by a strange eye in the sky.
Retrieved from Wikipedia CC BY-SA 3.0