“Promising Young Woman” – Cassie Thomas (Carey Mulligan) is on tour. No, Cassie doesn’t play in a band and trek across the country, although she could double as a punk rock act’s dismissive lead singer or perhaps, a local symphony’s cellist. Ms. Thomas is attractive, thin, whip-smart, and she just turned 30. She also turns most men’s heads, while working as a barista at Make Me Coffee or frequenting the clubs around town. Cassie’s on tour alright, but she’s embarked on a sneaky, seductive side-journey. On a typical night, she’ll…