In Plain Sight (US): Season 2, Episode 1

2 - 1: Gilted Lily

Mary helps to protect three siblings (Will Estes, Ellen Hollman, and Liza Weil) after their mother, one of her witnesses, is found dead in her house. A dead witness causes Mary to take leave of her administrative duties to solve a "Ten Little Indians" story, until her plan gets changed by her own brand of post-traumatic stress disorder.