The Three Souls of Harry James Potter
Status
Summary
James and Lily find a ancient and forgotten ritual that could protect their son from the Killing Curse in case Lord Voldemort manage to find them once completed. The only hiccup is that you need a sacrifice and your soul and spirit will be attached to the person you wish to protect. It does let you mind-speak as a nice bonus. (AU where James and Lily's spirit live in Harry's mind.)