Susannah Simon was always a do-gooder mediator, unlike Paul Slater who takes advantages of ghost and always break the mediator law, like when he stole the ghost of Mrs. Gutierrez's savings for her great-grandchildren instead of giving it to her great-grandchildren. Susannah has always notice that Paul is insanely into her, but was shocked when he asked Kelly Prescott, the most beautiful girl in school, to the junior year prom instead of asking Susannah. She's more lonely when Father Dominic, the principal of her school and her mediator guidance, left San Francisco to visit a long time friend of his whose in a coma. One typical afternoon in biology, Paul said he has some information about mediation to show Susannah and was rudely refering Kelly to a succubus. Afterschool came and Paul took Susannah to his beautiful and big house and try to find out more about her love life with Jesse De Silva, Susannah's handsome ghost boyfriend whose living in the school's courtyard now, Susannah was uncomfortable telling Paul about this kind of stuff so she ran out without saying goodbye to his small family in California. Susannah also notice how he seems like he's threatening to destroy Jesse. Later in the middle of the night, Susannah payed a visit to Jesse's and told him that Paul is up to no good and that she will ignore his threatening words and stopped him before he goes any further. Then they made out in Susannah's mother's car and Jesse made her promise to be safe and be calm until all of this chaos becomes clearer. The next day after social studies class, Paul revealed to Susannah that he will go back through time in the 1850s, or Jesse's time when he was alive, to saved Jesse from being murdered by Felix Diego, a slave runner, which in the presence shows that Susannah will never meet Jesse because he wasn't killed by Felix Diego. Susannah warns Paul about messing up the natural orders of things in the presence, but Paul won't listen. Instead he informed Susannah that this time, Jesse will be on his side instead of hers.  Susannah was concerned of this so she went and see Paul's grumpy grandfather, who's secretly Dr. Slaski, the man who wrote a popular but unbelievable (to regular humans) about mediaton. Susannah wants to know how to travel back through time in the correct way so she won't mess up history and herself. Dr. Slaski says she needs an object that was once used by the person (ghost in the presence) when they were alive, then pick a spot where that person has once stood, closed your eyes and just shift throught time. Of course, Paul was doing a good thing this time and saving Jesse's live but without Jesse in her life, Susannah would be dull and heartbroken so now she don't know how to deal with this mess. Susannah tries to call Father Dominic, but he is too busy taking care of his friend in a coma so she went to Paul and tries to talk him out of it. Paul was surprised because his grandfather doesn't talk to anybody, but now he talks to Susannah. She never did talk Paul out of it but was furious when he brought the plan about saving Jesse's life to Jesse, who wants Susannah instead of his life. During the bake sale for the middle schoolers, Susannah found out that Paul is using Jesse's buckle as his object to the past and she also found out that Shannon, her bake sale partner, liked her extremely intelligent stepbrother, David. After that bake sale, Susannah went to Paul's house to talk to his grandfather again, only to find that Kelly and Paul were awkwardly making out on the couch and Dr. Slaski with an ambulance. Susannah also notice that the people in her surroundings are having such a better life right now than she has, starting with her albino best friend CeeCee Webbs being asked to the dance by the guy she likes. When Jesse and Susannah were on their date night, Jesse asked Susannah what was Paul doing down at the school, she freaks out because that's the place he was going to go back through time and ran as fast as she could to school, along with Jesse, whom she told the whole truth to. Jesse stopped her from going down to the school and she just shifted right there, in her bedroom. But back in time she wasn't in her bedroom, she was in the boarding house Jesse had settled down in when he was alive. She was kicked out of the house when the landlady saw that she was not wearing a hoop skirt, so she found Paul in the horse barn, set a bed and slept until morning. Until morning she realized that Paul was taking care of her and tricking her when he said he was going to save her, but instead tie her with a rope and put a handkerchief in her mouth. In the morning, Jesse (who doesn't know Susannah at that time), found her tied up and saved her but was disgusted by the fact that she was wearing pants. When Susannah saw how happy and helpful Jesse was, she decided to take sides with Paul and let him live. But when she explained to Jesse, he doesn't seem to believe her. When Felix Diego showed up and tried to kill Jesse, he held Susannah as a hostage but let her go falling on the hay and the lantern which burst into a fire. Jesse jumped in to save her and Susannah shift back to the presence, bring Jesse's body with her and when ghost Jesse jumped inside that body, he became alive. Susannah and Jesse decided to go to prom together the next several mornings. Susannah also introduced her boyfriend to everyone and forgave Paul. Father Dominic found him a job as a doctor assistant (since Jesse always wanted to be a doctor) and an apartment to live in. At the end, Susannah said that her heart burst with joy as she kissed him.