Can You Solve These Mysteries (Correctly)?

Welcome, fellow detective.

Welcome, fellow detective.

Welcome to Detective Academy. You are to solve the mysteries that, unfortunately, the agency's other detectives can't solve. I am the darkness who sent to evil after the people for you to stop. Go, listen to your boss. I know the answer and so should you. But you will never catch me...

Boss:

We've been experiencing a chain of events disturbing the peace. It is up to you to save the people, and arrest the guilty. Wether it's a mafia kidnapping people, or a murderer hiding, you must persevere, or else, they will get you instead. Good luck, and if you complete each task correctly, a prize awaits you, for these cases rely on your brainpower!