Who Is "The Professor" on The Perfectionists? Breaking Down the Most Likely Suspects

Why She's the Killer:

• After Nolan cheats on Ava with another girl, it's possible that Ava wants revenge. Not to mention, she could be holding some resentment for having to keep their relationship a secret all this time.
• Ava later tells Caitlin and Dylan that she followed Nolan to an abandoned cabin before he was killed. What else is she keeping a secret?

Why She's Not the Killer:

• Even though she is hurt about their breakup, she is pretty shaken up by his death. Deep down, it's clear that she and Nolan really did care about each other.
• She is also part of the group being surveilled by the professor.