The fourth season focuses on the reign of Louis XIV from 1643 to 1701. The series traces his childhood, the influence of Mazarin and his mother during his early years as well
The crooks in London know how it works. No one carries guns and no one resists the police. Then a new gang appears that go one better. They dress as police and steal from the crooks. This upset's the natural order of the police/criminal relationship and the police and the crooks join forces to catch the IPOs (Impersonating Police Officers), including an armored car robbery in which the police must help the gangs to set a trap.