Daubeney Carshott, a concert pianist, leaves London to dive for pearls on Thursday Island in the South Seas at the whim of Stella Raff, his fiancée. Once there, he discovers that the life he leads as a pearl diver is better in every way than his former existence as a social-lion pianist. He meets and falls in love with Lorna Quidley, after learning this Stella had send other suitors off in quest of a giant pearl for her.

George is a disaster-prone zoo attendant who accidentally discovers a substance that accelerates motion, enabling his greyhound to run faster. This attracts the interest of a gang of criminals, who kidnap George's dog and plan to substitute their own in an important dog race. George and his friends defeat the crooks and their dog wins the race.

Joan (Helen Twelvetrees) is a Canadian, adopted by Ma Dawson (Nellie Ferguson), a struggling horse breeder and trainer. Joan thinks "legs don't make a race horse, it's blood", and so she buys an unwanted thoroughbred colt called Stormalong. Helped by Ma's son Tommy Dawson (Frank Leighton), Joan restores the horse to health and fitness, and soon enough the horse is winning race after race, becoming a favourite for the Melbourne Cup.