A notorious homewrecker is discovered dead in a mud bath at a fashionable spa. Burke soon learns that every other guest at the spa, including the owner, had a strong motive for murder. The strongest case is against the woman whose husband might have been planning on divorcing her to marry the victim. A movie starlet, the best dressed woman in the U.S., a millionairess and her aunt/companion, and the spa's owner also need to be carefully watched. Even after Burke is viciously attacked, he puts himself in danger again in order to smoke out the real killer.