Molly and David are driving on their anniversary late at night. As David distracts Molly from her driving, the couple sees a strange man in the road. Molly desperately swerves her car to avoid hitting the man but the couple crash their car down the hill. After Molly wakes up, she wanders around to find David and she finds a house and a strange man appears in the doorway. Meanwhile, Sam and Dean are driving and suddenly, Molly stands in the middle of the road. Dean quickly steps on the brakes and Molly asks the two brothers to help look for her husband. When Molly leads the two brothers down the hill, Molly's car is gone but Sam believes Molly is telling the truth. Sam explains about a man named Greely who died in a highway crash and haunts the highway every February 22. Sam, Molly, and Dean explore Jonah Greely's home. Dean finds the attic and the three discovers a corpse of Greely's wife, Marion. Dean reads Greely's love letter that is address to Marion, and Sam discovers a portrait of a tree with the date of how long Greely has died. Sam explains to Dean that they should look for a tree that is use as a burial marker based on the portrait's infomation. However, a ghost attacks Molly and Sam saves Molly. The three escapes the house to search for Greely's grave.
At Greely's grave, Sam explains to Molly the weaknesses of a ghost. To "kill" a ghost is to burn the remains such as bones, hair, and anything that has the DNA of that ghost. After burning the corpse, Molly still looks for David but Sam hesitates to tell her. Suddenly, a strange figure grabs Molly and dives into the water. Sam and Dean quickly runs to Molly's rescue while thinking about the ghost and who is it. Dean and Sam looks at each other and the two split. Sam rescues Molly as Marion fades temporarily. Marion is ghost who wants people who lost their loved ones to suffer like her. Meanwhile, Dean heads over to burn Marion's corpse, but the rain wet the flames and he runs out of oil. Dean burns his shirt to destroy Marion's ghost.
Sam and Dean drives Molly to David's house. Sam reveals to Molly that David remarried and Molly died 15 years ago. Sam explains that the two ghosts, Greely and Marion, uses Molly to lure victims and that Molly is stuck in time. The reason that Molly cannot cross over because she cannot remember. Sam tells her "It's time you say good-bye to him" because David said good-bye to Molly many times. With that quote burning in Molly's head, Molly hugs Sam and thanks Sam. Molly says good-bye to David as she crosses into the afterlife.
Sam has a flashback of his mom burning and develops a migraine from it.
Molly hugs Sam
Sam: It's time you say good-bye to him.
Salt can repels it but does not destroy ghost. Burning the remains of the ghost to defeat it. Iron repels ghost.