In Bohemia-on-Sea, among the remnants of steel mills and an array of eccentric characters, meet our unconventional detective duo: Shirley Holmes, the hard-living dinner lady, and her steadfast companion, Donna Watson, the gin-loving cleaner. Though not the brightest stars in the northern England sky, their unorthodox approach to solving mysteries has made them legends in their own lunchtime.

When the enigmatic Jenny Adler presents Shirley and Donna with a peculiar problem, the dynamic duo is thrust into a comical and perplexing case that threatens the tranquillity of their corner of the world. As Shirley and Donna dive into their investigation, they navigate a landscape filled with eccentric characters, each harbouring their own quirks and secrets.