The ritual must be started before midnight, and finish close to midnight, or else it will not succeed at all. The body or the grave must be within the circle and the circle must remain unbroken.
Anyone whose body has been properly buried in religious rites or whose grave has been sanctified cannot be recalled with this spell.
If the spell succeeds the spirit of the deceased will visit the circle for a full minute and can be spoken to. The silver coin must be paid to the spirit once it arrives or it will leave. The dead will answer any questions regarding it's life, but not about the afterlife. The longer someone has been dead, the less sense they will make and those who have been dead for many years may be completely impossible to communicate with.