This chapter considers the relations between the agent and third party. The typical function of an agent is to affect the legal position of his principal in relation to third parties, typically achieved by the agent effecting contractual relations between his principal and a third party or third parties. To this contract, the agent is usually a stranger and it therefore follows that, providing all parties perform their obligations, there will be no legal relations between the agent and third party, aside from any warranty of authority that might be deemed to exist. If the parties, however, fail to properly perform their obligations, legal relations between the agent and third party may arise that allow one party to sue, or be sued by, the other. This chapter discusses the general rule, and also those situations where the agent and third party will acquire a cause of action against the other.