1. Downshift to Danger

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. 29 September 1974

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.

2. The Game of Survival

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. 20 October 1974

A temperamental tennis champion is suspected of murdering a newspaper magnate who had him suspended.

3. Buried Alive

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. 10 November 1974

A WWII intelligence colleague, long since thought to be dead, turns up and is murdered.

4. Guilt by Association

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. 8 December 1974

Mildred is accosted while serving on a sequestered jury, then another juror is murdered in his locked room.

5. Night Train to L.A.

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. 19 January 1975

Mac heads south to a police convention on a train filled with officers, Mildred, and the author of Cops and Other Crooks, who is murdered en route.

6. Love, Honor and Swindle

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. 16 February 1975

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