Ask any nval for a specific Plot. He must show you all his hidden Plots, give you all instances of the Plot you named, and discard two undrawn Plots for each one. But if he has nonę of the Plot you named, all your Plots are exposed.
Anyone who has received a Plot card from a rival or has been forced to show a rival any non-exposed Plot in his hand or deck is immune to Go Fish until the end of his next tum.