Who is pressuring Skiffington to find Caldonia's missing slaves and what temptation is adding to Skiffington's stress?

Skiffington has become afraid that Robbins and the other landowners will want to replace him like they did Patterson because he is not controlling the runaways as he was before. Robbins comes to Skiffington and pressures him to find the missing slaves even as news of three new runaways reaches Skiffington's office. At the same time, Skiffington is struggling with a growing lust for his own slave, Minerva.