Abby gives David the clue he needs, but Olivia hears everything
The Missing Link
Abby figures out that the man David met was a plant hired by Olivia. She also tells him that Jesse Tyler at Cytron was working on software for electronic voting machines. Unbeknownst to both David and Abby, Olivia and Huck are listening in on their whole conversation--they've bugged David's apartment!