On a hot midsummer day in the Surrey countryside, close friends Kristin, Vee, Bibi and Hailey are celebrating their Ladies' Team victory at the exclusive Royal Oaks Tennis Club. But when their oh-so-charming coach, Jeremy, collapses after tucking into a carefully decorated sponge cake, it seems the season isn't just ending with a championship trophy - but with a murder. Off the court, it's clear that each of the four women has been keeping a dark secret, but surely no one would wish Jeremy dead? Or perhaps revenge truly is a cake best served cold.