Can you explain this question?

Charles leaves his classic RollsRoyce car {which he inherited from his father) with Hampstead Cars Ltd for the car to be serviced. Hampstead Cars' main business is to sell cars as agents for private sellers, although occasionally it also carries out repairs and servicing of cars as a side business. Charles returns a week later to pick his car. However, an employee of Hampstead Cars, has inadvertently sold the car to Singh for $20,000. Singh had no idea that the car was left with Hampstead Cars for servicing rather than a sale. REQUIRED: Advise Charles if he can legally get his car back under Agency Law