Grapevine Hills Vineyard and Winery is one of the greatest vineyards in all of Equestria. However, it has recently become the site of three murders, all apparently happened at the same time. The current detective on the case believes the owner Sour Grapes to be responsible for their deaths. But Private Eye has his suspicions about the whole case. What follows is conspiracy, cover ups, a secret the owner is keeping from her fellow workers, and a feud that goes back to before Private was even born. Private will need all the help he can get to solve this case. Luckily, Sour Grapes is quick to provide.

This story is a crossover between Equestria Noir and The Sour Grapes Chronicles