In a lost and lonely state (due to his sinful choices) Saul has contacted dead Samuel. But Samuel has no comfort for him. The king has sown disobedience to God and now he will reap the consequences of that: tomorrow,
Contacting the dead
Due to his sin, Saul is all alone and frightened of his enemies. David will not help him; God will not help him; he’s in a living death. So in desperation Saul does the only thing he can think of