Riddler's Queries
1

What appears once a year, twice a week, but never in a day?

Letter E

2

When is a door not a door?

When it is "ajar"

3

I face my brother, he faces me. On our sides, two more I see. Together, we make room for thee.

Walls

4

It is in rock, but not in stone; it is in marrow, but not in bone; it is in bolster, but not in bed; it is neither living, nor it is dead. 

Letter R

5

First, tell me a person who lives in disguise; who works with secrets and tell nothing but lies. Next, tell me what is the last of mend, the middle of middle, and the end of end. Then, tell me what is the sound often heard when thinking of a hard-to-find word. Lastly, put the together and tell me this: what is the creature you wouldn't want to kiss?

Answer to first: SPY

Answer to second: D

Answer to third: ER

FINAL ANSWER: SPIDER