Phoebe Atwood Taylor: Diplomatic Corpse (1989)

From the Publisher:
The chaos surrounding preparations for the Quanomet Associates Annual Historical Pageant is such that someone almost seems intent on sabotaging the event. Several participants even feel that their lives might be in danger. But only Muriel Babcock is dead certain of it, and her battered body in the cemetery is proof sufficient.

To underscore the point, however, someone biffs Asey Mayo over the head. When he awakens, it is to confront more elusive clues and suspects than he can handle. But help is ready at hand. Thanks to Doc Cummings and his cousin Jenny, Asey is off on an adventure that becomes one of the wildest of his career.

PHOEBE ATWOOD TAYLOR (1909-1976) lived most of her life in Boston and on Cape Cod. In addition to the Asey Mayo series, she wrote a number of Leonidas Witherall mysteries as "Alice Tilton," and Murder at the New York World's Fair as "Freeman Dana."

Phoebe Atwood Taylor: Diplomatic Corpse. An Asey Mayo Cape Cod Mystery. Countryman Press / Foul Play Press, ISBN: 0881501468 (August, 1989), 244 p., $5.95.