The Marks By My Whole Might Get Me Caught

Riddle: My second is performed by my first, and, it is thought, a thief by the marks of my whole might be caught. What am I?

Answer: A Footstep.

Source: https://www.riddles.com/642

My second is performed by my first, and, it is thought, a thief by the marks of my whole might be caught.
What am I? — The marks by my whole might get me caught by Anonymous v1.

Riddle: My second is performed by my first, and, it is thought, a thief by the marks of my whole might be caught.
What am I? Answer: A Footstep. — by Anonymous v2.