At the end of season two, Orson ran over Mike Delfino for reasons unknown at the time. Suspected of cheating on his wife, Alma (who is originally thought to be dead), and killing a woman named Monique Pollier, Orson is placed under constant suspicion from the housewives and some of the other neighbours, especially Mike, who is the main suspect in Monique's murder. To complicate matters, Orson's mother (Gloria Hodge) and Alma come to Wisteria Lane and take matters into their own hands. The housewives are brought together this season to comprehend the mystery and put the pieces of Orson's past together, while trying to sustain their individual lives that are causing them much trouble.