Source plot synopsis — includes the ending
After the funeral and several days of mourning, the four friends steal back the stone and use it to talk with Kevin's spirit. They also meet the ghost of McKittrick, who reveals that he used to work for former U.S. Army general Major Oh Russ, who had organized the Duat Stone's recovery and thus use it to control the deceased to accomplish his world invasion plan. McKittrick rebelled and stole the Duat stone.
Tajunga gets quarantine lockdown over a government conspiracy involving contagious disease as a cover up operation. The four friends escape, only to fall off the road into the dark forest, where they encounter a military camp of ghost children deceived by an evil ghost. After liberating the ghost children, the four friends return to the Tajunga to save their families and friends, but Oh Russ has already captured them. Friends escape through a river into the cavern, but Big Joe gets mortally wounded and eventually dies. Surviving trio discovers inside the cavern hieroglyphs, which seems to imply the Duat Stone was an artifact of the gods.
After getting out of the cavern and dealing with the ghosts of the old west, Major Oh Russ catches up to them, steals the Duat Stone and kidnaps Charlie. Matt and Chris give a chase and infiltrate Oh Russ’ headquarters where they encounter Osis, the Egyptian god of balance, who reveals Oh Russ is the servant of the Egyptian god of destruction Seth who usurped his brother Osis' position as the Keeper of the Living Balance. The boys also learn Oh Russ is using their families and friends as an energy source to power up the Duat Stone. While they manage to defeat Oh Russ and rescue Charlie, Matt dies. Charlie and Chris share a final kiss before Charlie escapes with all of the townsfolk while Chris stays behind, activates the interdimensional portal and destroys Seth with his soul, thus saving everyone at the cost of his own life.
In the epilogue, Charlie, having grown old, tells the events of the game as a story to her grandchildren. After they leave, Charlie, wanting to return to her friends, activates a machine based on Matt's discoveries to send her soul to the afterlife as a girl she was back then and reunites with her childhood friends.
Sources and content license
Source and revision history ↗ · Adapted from Wikipedia contributors, Crossing Souls. Section headings and formatting adjusted. · Content license