When the son of McGarrett's sister falls ill with cancer and she becomes involved in ‘naturology', her husband calls in Steve to investigate and persuade her to stop paying for the useless treatments. However, the quack doctor sets up a court case to prevent McGarrett from closing her practice.

McGarrett must use all legal means possible to win the court case against Dr. C.L. Fremont, stopping her fake treatments and saving his sister from more anguish and pain.