Emma pretends to be Sutton as she tries unravel Rebecca's lie on The Lying Game. "Catch Her in the Lie" is the seventh episode of the show's second season.

The Lying Game Season 2 Episode 7 Quotes

Sutton: Trust me.
Rebecca: Well that's just it Sutton, sometimes I'm not sure if I can.

If anyone found out that you know about me and Sutton your life could be in danger.

Emma [to Laurel]