The Halloween party was in full swing when Philip made his entrance dressed as a boxer. "Cleopatra" stopped him to get acquainted, but got the brush off when Philip told her that he had been invited by someone else and wasn't interested in her offer. Stylishly late, Cassie, clad in next-to-nothing and brandishing a whip said, "Trick-or-treat." Philip was preoccupied and asked when she thought Rex and Mimi would arrive. Cassie angrily told Philip that he only wanted to harass her brother. Acknowledging her loyalty to her twin brother, Philip asked Cassie what she would do if Rex really were the killer roaming Salem. He advised her that if he was they had to stop him before he killed anyone else, and if he wasn't, he would need an alibi for that night in case anything happened. Cassie relented and the two headed out to find Rex.
Shawn and Mimi argued about Rex's innocence in the Salem murder cases. A little nervous, Mimi decided to call Rex's cell phone, but was alarmed when it rang in the apartment. She realized that it was unusual for Rex to not have his phone with him. Shawn kept trying to convince Mimi that they had to find Rex before he killed again, but Mimi told Shawn that he was jumping to conclusions and reminded him that Rex had successfully passed a lie detector test. Shawn told her that if Rex was innocent, she should prove it to him and they left to search for him. Down on the docks, they ran into Will and asked why he was there alone on such a night. Will admitted that his friends left him to find his own ride home because of the scene Sami and Lucas had made at the class Halloween party. Shawn and Mimi offered to take Will home to his parents, but when they got to Sami's apartment there was nobody home. Likewise, Lucas was absent, and Shawn lamented that Rex wasn't the only one who would need an alibi for Halloween night if anything happened. They took Will on to the Brady Pub where Will bragged to Grandpa Shawn about the food fight his mom had started earlier that evening. Shawn asked if they had seen Rex around the Pub that night, but the elder Shawn told them no. Just then, the patrons of the restaurant noticed a strong gale of wind outside. Philip arrived shortly and tried to reach Victor and Nicole by phone, but to no avail. Cassie was also unable to reach Tony, so Philip, Mimi, Shawn and Cassie split up to look for the missing suspects. Back at the loft, Shawn and Mimi stopped by to see if Rex had returned. He called Hope to tell her that they had done some "leg-work" for the police and had found that all the suspects were unaccounted for. Mimi wondered to herself if Rex could in fact be the Salem Stalker. At the docks, Cassie doesn't want to believe that her brother could be so morbid.
A dressed-up Bonnie Lockhart paused when the wind picked up and she became scared. She lit a cigarette and turned to look right into the eerie mask of a trick-or-treater. He aimed a gun at her, and she pled with the person to leave her alone. When he didn't move, she began singing a church hymn, but then the person apologized for scaring her, stating it was only a joke. She sat down, still jumpy, and began to panic when a black cat crossed her path. Bonnie quickly grabbed a Halloween superstition book and tried everything she could to break the spell the cat had placed on her. When they didn't work, she hurried off to Celeste's house to speak to her.
At home, Celeste sat to look at her tarot cards and find out for herself what Maggie's fate would be. She sensed evil and began to pray for Maggie and Mickey. Suddenly, there was a knock on the door. Bonnie Lockhart burst in and began rambling about her "awful experience." She promptly asked for a scotch to calm her nerves, and then suddenly Celeste said "it's starting", and all the lights went out. Bonnie screamed, but Celeste asked her why she was there. Bonnie told her about the cat and asked her to read her tarot cards, but wanted to go somewhere else to do it since Celeste's apartment scared her. Bonnie dragged her off to the Pub, where Celeste quickly excused herself to call Lexie. While the wind picked up outside, Bonnie grew tired of waiting and decided to turn the cards over herself. She picked up a card from the middle and to her horror saw that it was the death card.
At the Horton's home, Mickey hung up the phone and suggested that Maggie go on to bed. He assured her that she was safe. Outside, a dark figure with a hockey mask appeared in the fog. As he approached the house, he relived the memory of shooting Abe Carver, and then hitting Jack Deveraux with a brick. Suddenly he saw the image of Maggie in the hospital room trying to get away. He took out a photo of Maggie and ripped it to shreds. Back inside, Mickey and Maggie remembered Halloweens past when their daughter dressed up for trick-or-treating. Maggie became upset and worried that she would die soon and would create no more fond memories. Mickey tried to tell her that she would be fine, but suddenly Maggie stood up, looked out the window and said, "No!" Mickey explained that she was only seeing the officer outside making his rounds and checking on their house. He tried to get Maggie to go on to bed as they had a big day the next day with Jack's funeral and then a session with Marlena for Maggie to try to remember the killer. They headed upstairs while outside the killer tried to pick the lock on the door. Upstairs, the lights flickered, and Mickey remembered that he had not deadbolted the door downstairs. He went back down and through the window he saw the hockey masked face. He told the person that they were done for the night and were not handing out anymore treats. The masked person was eerily silent. Mickey quickly locked the door and reset the alarm, but the masked man was still on his doorstep. He turned out the lights and headed back for bed. Outside, the killer heard a noise and ran to hide. The officer rounded the corner, but found nothing but a black cat running through the bushes. Back in the house, Mickey warned Maggie that if she roamed the house at night, she should not open the doors for anyone. Maggie turned over in bed and told Mickey that she thought they had been too hard on the suspects thus far and that she was going to try to not be so suspicious of them from then on. She tried to convince herself and Mickey that she thought the killer was someone they didn't know. Unable to sleep, Maggie went downstairs to read the paper in the kitchen. She put the paper down and noticed a masked figure outside the door. She hurried to say hello and they took off their mask. She was happy that someone had stopped by to see how she was, and turned away to turn off the alarm. As she opened the door, she let the person inside and shut the door behind them. She was friendly and made small talk while she turned her back to reset the alarm.