Two tanks of radioactive gas are stolen; and the tire track of a 1930's automobile is the Angels' only clue. Since there is an antique auto rally being held nearby, it makes sense to go there and see if anybody looks suspicious. Charlie provides Bosley with a Model T Ford so he can enter the competition, and the, three Angels all pretend to be reporters working on stories. The lab analysis indicates that the tire track could have been left by only four of the antique cars. One of these is owned by Mrs. Martha Milton, a middle-aged woman with whom Bosley is immediately on very friendly terms. One of the others, the 1936 Dodge that we recognize as the one used in the crime, is being worked on by two friendly mechanics, Marshall and Hendricks. But watching them as they talk to reporter Kris is Greeves, the man who has been driving the Dodge earlier that day. The Angels, knowing when the crime took place, are trying to establish the time when the contestants checked into the rally, since anyone who arrived early in the morning could not be guilty. Greeves is very worried since he knows that his late arrival was covered up by a $500 payment to the official who agreed to doctor the check-in list. He overplays his hand by killing the official in the hope that it will protect his secret. Kris now knows exactly which car the criminals are associated with, but by snooping too much she is captured and forced to ride with Greeves in the race. Realizing where Kris is at the last moment, the other Angels and Bosley jump into the Model T and zoom past the entrance. They are out of the proper order, but just in time to rescue Kris from the back seat of Greeves' getaway car. Kate Jackson, Jaclyn Smith and Cheryl Ladd star as the Angels, Sabrina Duncan, Kelly Garrett and Kris Munroe, respectively, who work for Charlie; an unseen and very sophisticated boss who phones in their instructions. David-Doyle stars as Bosley, Charlie's harried assistant.