DESPERATE HOUSEWIVES - "Who's That Woman?" -- Cash-strapped Mrs. Huber figures out that Susan had something to do with Edie's house fire and tries to blackmail her; Carlos becomes suspicious that Gabrielle is seeing another man, but targets the wrong suspect; Lynette balks when the twinsÕ teacher insists the boys have ADD, and Bree struggles with her rebellious son after Rex moves out, on "Desperate Housewives," SUNDAY, OCTOBER 24 (9:00-10:00 p.m., ET) on the ABC Television Network. (ABC/DANNY FELD) EVA LONGORIA, JOHN HAYMES NEWTON