Episode 29 of "Bones"
s02e07 The Girl with the Curl

Brennan and Booth investigate the death of Brianna Swanson, a young beauty queen whose decomposed remains are discovered at a Washington, DC, water filtration plant. Briannas father is a suspect initially, but new clues lead Brennan and Booth to Briannas dance school, where they glean key information. Meanwhile, Hodgins works up the nerve to ask Angela out on a date and after contemplating the pros and cons of dating a coworker, she agrees to go.