Part Three of the famous Flying Doctor adventure series. Dr. James is called to the north coast of Australia - into the pearling area. He's involved in a medical crisis when he dons a diving suit to examine the foot of a diver which has been caught in a giant clam. There's more intrigue and adventure when Dr. James is drawn into the troubles of a man who has discovered how to produce cultured pearls in tropical waters and who is being threatened by competitors. Cover art by R.E. Hicks.