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Frank's Diner (also known as Frank's Resturant) is a location in CSI: Crime Scene Investigation.
The CSI team often come here to eat featured in numerous episodes even in early seasons.
In A Kiss Before Frying, Ellen had asked Greg to meet him at Frank's Diner when Greg arrived to the Diner's parking lot was shot down whilst Ellen fleed the diner to catch a bus.
The CSIs arrive at their favourite diner only to discover 8 people who the CSIs know well due to their frequent visits to the diner dead. Only to find out one of the victims was out of place, as it later revealed the suspect was the CSIs good friend who owns the diner.