Judy runs an antique jewellery store. One evening, a hooded man stormed into her store and robbed $100,000 from the register. One month later, Judy decides to run a stocktake sale from 5.00 pm to midnight but is still afraid of being robbed. She asks Shelley, a police officer she knows, if she will attend her store while the stocktake sale is on and provide her with personal protection from any potential robbers. She offers to pay Shelley $1,000 for her effort. Shelley agrees, even though it is normally her night off duty. During the sale, she stays by Judy's side and protects her. The next day, she attends the store to collect her payment and Judy refuses to pay her. "You were just doing your duty - protecting me is what cop's do". Can Shelley enforce their agreement?