KC and Marshall are spending their day volunteering at the National Zoo, helping take care of the adorable baby tigers! While working, they meet a new friend named Sunwoo, who is visiting all the way from China. Sunwoos father has brought an incredibly rare and valuable jewel, the Tigers Eye, to display at a big zoo party. The glittering jewel is locked inside a highly secure room with no windows and a guard standing right at the door. But right in the middle of the crowded celebration, the building goes completely dark! When the lights finally flicker back on, the glass case is totally empty. The priceless Tigers Eye has been stolen, and nobody saw a thing. The young detectives are determined to figure out how the sneaky crook managed to escape from a locked room. Join KC and Marshall as they search the zoo for clues and question everyone who was at the party. You will need a sharp mind to help them crack this impossible puzzle. Can they catch the clever thief and recover the gem? Get ready to explore the zoo and solve the crime!