On 'The Gates' (Sun., 10PM ET on ABC), Chief Monohan gets arrested by FBI agent Cat Russo when she finds him trying to tamper with a list of "every vampire Robert Jessops has ever worked with."

However, a fellow officer discovers that apparently Russo's been dead for two years. Something's fishy. The agent returns to confront Monohan -- and bears her fangs as explanation. Turns out, she wants the list: It's revenge.

She was killed in the line of duty, and Jessops turned her into a vampire, against her will. As far as she's concerned, "The sooner the rest of this list is exterminated, the better for everyone."

Will Monohan hand it over?