Why is Jabez Wilson in need of a detective?

Jabez Wilson seeks a detective because he is perplexed by the sudden disappearance of his assistant, Vincent Spaulding, who left without explanation after helping Wilson with his business. Additionally, Wilson has become suspicious about the financial stability of his pawnbroking business, which has been negatively affected since Spaulding's departure. He hopes a detective can uncover the truth behind his assistant's actions and the mysterious circumstances surrounding his business.