Pressed clutched down, never came back up. Help!

[moody_i]

Unfortunately, yesterday I was driving my 2009 370z on the freeway and all of sudden as I was about to switch gears, the clutch lost resistance completely, therefore making it impossible to shift. First thing that came up in my mind is the slave cylinder went bad. I called a couple buddies and they told me to check the brake fluid. I checked it and it was clear, however around 10 minutes later I checked the clutch and there was a little resistance, enough to start the car and exit the freeway. However, first stop light and the resistance was lost and the clutch went limp once again. Checked the brake fluid once more and there was nothing. Checked for a leak where the piping is at and seen nothing. Checked inside the car where the clutch is located to see if there's a leak-- still nothing. Underneath the car-- no leak. I heard that's a good thing since it means the clutch isn't ruined, or drenched I shall say. What do you guys think the problem is? & how could I solve it? Is it the slave cylinder? Is it true if I switch the slave cylinder I have to change the master cylinder since they work together? Need solutions from you lovely ducklings. Thanks for reading!