While out at the movies with his friends, teen Greg Lux logs in to his family's home security cameras to see that his father, Mike, has been murdered. The new Chief Medical Examiner, that would be Curtis, hears a vibrating cell phone at the crime scene. It's coming from Greg's mom, Robin, who is found bound and gagged upstairs. Megan quickly determines that she's dead, too.

Mike Lux's business partner, Owen Kreger, wonders why his friend just didn't open his safe during this apparent robbery. Megan notices that Robin Lux's injuries aren't as severe as her husband's. She believes the killer knew and cared for her. Physical evidence suggests that Owen Kreger may have been involved. While it's true that Kreger was secretly in love with Robin, he's no killer.

Bud notices a business card for a plumber who had worked at places targeted in two other home invasions. This lead doesn't pan out, but another one arises. Megan realizes that Greg isn't an only child. He has a brother, Aaron, who took off four years ago. Not even Greg's best friend, Travis, knew about this. That's because Mike Lux wanted to erase all memory of his first born son. Bud and Sam arrest Aaron as he tries to pawn some of his mom's jewelry. Looks like there's a new prime suspect in town.