How can I get my XD camera card pictures back?

I have a Fuji digital camera that uses XD camera picture cards. The card had about 3 different events on it. Now it is gone. I put it in card reader. It acted like it worked at first--took it times showing on computer screen. Then when it was taken out of card reader and put back in again, it was gone. I was totally upset about it. How do I get those pictures back? Please help me about this one. Thank you.