1674, Mediterranean, Maghreb. Don Cossack scout Ivan Platov, sent to the Ottoman Empire under the guise of Turkish sailor Hassan, is completely legalized and enters the service, becoming the youngest officer in the Turkish fleet. Hassan is brave, intelligent, well-educated and can find a non-standard way out of a dangerous situation. But he has another valuable quality - he is incredibly lucky. And this cannot escape the attention of the powerful, who are trying to use such a valuable person for their own purposes. Suddenly, Hassan finds himself in the midst of dangerous events unfolding on the Maghreb coast. The interests of European states are closely intertwined with the interests of the Maghreb rulers - vassals of the Turkish Sultan, who want to get out of the subordination of the Ottoman Empire. Long-standing discontent, skillfully fueled by the emissaries of France and Austria, leads to a riot in Tunisia and an open confrontation with the Turkish sultan. Of course, it is impossible to forgive this. And the Turkish intelligence group, which includes Hassan, is sent on the Al Yasat trophy shebek to rebellious Tunisia.