The term FOLLOWS SURREPTITIOUSLY can be summarized by two crossword solutions: SHADOWS (7 letters) and TAILS (5 letters). To follow surreptitiously means to follow someone or something secretly, without being noticed. The word 'SHADOWS' implies that the person or thing being followed is not aware of it, as SHADOWS are often unseen. The word 'TAILS' suggests that the person or thing is being tracked, as if they were being followed by a tail.