Alec Mercer, professor i beteendevetenskap, får i uppdrag att utreda mordet på en mode-influencer, vars pojkvän har erkänt brottet. Mercer misstänker att det ligger mer bakom än vad ögat ser.

Alec kontaktas av sin gamla vän CJ som ber om hans hjälp efter att hon förgiftats med en ovanlig och dödlig nervgas. Med tiden som rinner ut pusslar Mercer ihop knapphändiga ledtrådar.

När ett passagerarplan kraschar i Potomac riktas misstankarna omedelbart mot piloten. Alec och teamet ombeds att undersöka pilotens personliga motiv och pussla ihop ledtrådar i hopp om att avslöja sanningen.

Alec and the team take on a kidnapping case at the request of a desperate father. Their investigation is hampered by a complicated family dynamic that slowly reveals everyone's hidden motivations.

Alec and the team head to Las Vegas to help Camille, a former colleague turned expert poker player who's been lured into danger. They must take some risks to solve a gambling mystery before Camille gets hurt. Marisa makes a significant discovery.

Alec agrees to testify as an expert witness in a wrongful death trial for a friend of Kylie's. As he faces an old nemesis, he discovers competing emotions around an accidental shooting. Marisa reaches a decision about the bombing investigation.

Alec's first date with Rose turns into a 24-hour excursion when they find themselves taking on an investigation involving a forged masterpiece. Marisa and Kylie attempt to revive their friendship, which has faltered since Alec and Marisa's divorce.

Alec takes a case involving a young burn victim and arson that forces him to confront some trauma from his past. Phoebe and Rizwan compete for an important research grant.

After witnessing a hit and run during a friend's livestream, Alec and Kylie aim to prove it wasn't an accident. As Marisa and Jace continue their investigation into the church bombing, they set their sights on a prominent senator.

Alec and his team come face to face with the man who was put away for the church bombing 20 years earlier. Marisa and Kylie work together to save Alec, Phoebe and Rizwan. Jace makes a critical break in the case that changes everything.

Alec and Marisa are close to finding the culprit of the church bombing. Kylie gets an interview with the FBI, but is pulled into the investigation. Rose tracks down a witness. Phoebe and Rizwan make a discovery that sheds light on the truth.