The grand prize of the 20th Annual Golden State Rally in Monterey is an antique car collection willed by a late millionaire. Mischief develops into mishaps and worse, until an entrant is killed.

It seems that Mac's sister is engaged to a con man out to diddle a mining company.

At Andy Kenesaw's 90th birthday party, an attempt is made on his life, just before a stockholders' meeting of the company he founded with Mac's grandfather years before (Kenemac Alfalfa Corporation, est. 1901) is held to consider a merger bid from Harvest Foods Incorporated.

A naval lieutenant facing a court-martial on a murder charge is appointed counsel in the person of Commander McMillan, USNR.

Up against a hit man who announces himself.