What has a ring but no finger?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Replace the question mark with the correct number.

A person is found murdered in his Chamber. When the crime scene is investigated, the Investigator find out that there is a calendar on which the victim has written a few numbers with his blood. The numbers are 4, 11, 11 and 4.

There are four suspects in the murder, John, Jacob, Anna and Lee. Can you find out who is the murderer?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

What does it mean?