 Cash-strapped Mrs. Huber figures out that Susan had something to do with Edie s house fire and tries to blackmail her, in which Susan is forced to recruit her daughter Julie to find the incriminating evidence Mrs. Huber has. Meanwhile, Carlos becomes suspicious that Gabrielle is seeing another man, but targets the wrong suspect: the cable guy instead of gardener John. Lynette balks when the twins  teacher insists the boys have A.D.D. but tries to salvage the matter by separating the boys. Bree struggles with her rebellious son Andrew after Rex moves out. Both Susan and Edie continue to vie for Mark s affections, both of whom are unaware that Mark has an agenda when he s revealed to have a map and personal files on EVERY resident (incluing Susan) on Wisteria Lane. Also, the ladies show Paul the anonymous blackmail/death threat letter sent to Mary Alice, unaware that he already knows about Mary Alice s troubled life and he secretly hires a mysterious "associate" named Mr. Shaw, to find out who sent Mary Alice the letter.