Can you find the key in the picture below?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

Identify the 10 differences between the two given pictures.

Name a key which is hardest to turn.

The more of this there is, the less you see. What is it?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

A hen, a dog, and a cat are stolen. Three suspects are arrested named Robin, Steve, and Tim. The police are sure that all of them stole one of the animals but they don't know who stole which animal.

Sherlock Holmes is appointed to identify and is provided with the following statements from the investigation.

Robin - Tim stole the hen
Steve - Tim stole the dog
Tim - Both Robin and Steve are lying. I neither stole a hen nor a dog.

Sherlock is somehow able to deduce that the man who stole the cat is telling a lie and the man who stole the hen is telling truth.

Can you help him find out who stole which animal?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?