Third party liability

Mike buys for Sally, his girlfriend, a car before his trip overseas. He buys the car at Ace Autos. Ace Autos is to deliver the car to Sally within seven days. Mike signs the contract and prepays. Mike then leaves the country for his trip. Ten days have gone by and the car has not been delivered. Sally is not able to get in touch with Mike, and she calls Ace Autos. They refuse to talk to her and claim that they have a contract with Mike.

Explain what legal rights, if any, Sally has as to this contract for the car. Discuss specific points of third party liability laws.