Pleusicles loves Philocomasium, but she is kidnapped by Pyrgopolinices. Palaestrio, faithful servant to Pleusicles, witnesses this and goes to tell his master, but is captured by Pirates and ends up a servant to Pyrgopolinices as well. Palaestrio still gets word to Pleusicles, who arrives on scene. Palaestrio then invents a complex and daring plan involving mistresses, supposed twin sisters, disguises, family friends in the right places, and a monkey to try to escape Pyrgopolinices and reunite Pleusicles and Philocomasium.