Answer:
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
You use it between your head and your toes, the more it works the thinner it grows. What is it?
A small hill with seven holes.
What is something you will never see again?
A setting that proved to be deadly for Abraham Lincoln.
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?