Police arrest Karen Read for the murder of her boyfriend, Boston cop John O’Keefe, but her lawyers believe she is the victim of a police cover-up.

Opening statements kick off a heated murder trial, and jurors hear troubling voicemails. "Free Karen Read" supporters increase outside of court.

With shoddy evidence collection and bad police work exposed at trial, Karen’s legal team suggests that someone may have killed John inside the house.

As the case sparks a civil war in Boston, some dub Karen “America’s Happiest Murder Defendant.” At trial, humiliating texts shock the courtroom.

As the trial winds down, experts attempt to recreate John’s death, the defence brings in one final witness and closing arguments grip the nation. Karen, emotional after a long haul, anxiously awaits her fate. The jury returns with an unexpected note.