In Book 6 of the Hardy Durking Travel Mystery series, Homicide Herault by Bluette Matthey:

Veteran trekker Hardy Durkin leads his first bike tour group to Béziers in the South of France, during its annual grand Feria, for what is expected to be relaxing, uneventful bicycling in the Hérault region. This notion is kicked to the curb when a double cold-case with present-day repercussions is discovered on one of the group’s outings.

@HardyDurkin