Two Harlem detectives, Gravedigger Jones and Coffin Ed Johnson, investigate a back-to-Africa rally led by charismatic preacher Reverend Deke O'Malley. The rally is interrupted by armed thieves who steal a large sum of money raised for the cause. The detectives suspect that O'Malley might be running a scam, exploiting the community's hopes for financial gain. Their investigation leads them through various levels of the Harlem underworld, crossing paths with colorful characters, corrupt officials, and local hustlers.

As they delve deeper, the detectives discover that the stolen money may be hidden in an unlikely place—a bale of cotton that moves mysteriously around the neighborhood. Each lead brings new challenges and dangers, revealing the complexities of their community and the racial politics of the time. Gravedigger and Coffin Ed must untangle a web of deceit and navigate through personal and professional obstacles to uncover the truth, all while reflecting on their roles in seeking justice for their neighborhood.