Disappearing Ring 

Nan Yao 

You are a detective and help FBI to solve some important cases. you should guess what happen in countinous and help FBI catch the dimond ring thievies. There was a very famous diamond ring, the centre blue-white stone weighted more than 33 carats and was roughly the size of a small marble. Not surprisingly, the large ring was worth about 275,000 in 1969, the year our story takes place
I wish I can have the diamond ring!!!
The ring must belong to a rich guy.