Lisa Kaminir

Dexter's world is rocked when a rival serial murderer, dubbed the Ice Truck Killer, privately contacts him and reveals that he knows Dexter's grisly secret.

Meredith grows increasingly dissatisfied with the unknown details of Derek's life. Meanwhile, Alex treats Devo, a patient whose religious beliefs jeopardize her chances for recovery; Izzie contemplates reconnecting with her estranged mother; Zoey, a pregnant woman in her 40s who's been diagnosed with cancer, disagrees with Cristina's medical advice; and the interns are mystified by Cable, a patient who's being treated for seizures and who thinks he's psychic.

As the BAU wraps up an investigation into unusual stabbings in Upstate New York, Morgan's visit with one of the crime's survivors could uncover more questions left for the team to answer. Guest stars include Aasha Davis and Emayatzy E. Corinealdi.

A chance encounter with a military colonel (guest star Aaron Raymond) leads Jane to believe the officer is hiding something, prompting him to dig into the closed murder case of the man's wife.

Danny and Maria investigate a possible serial killer who sends a chilling message to Danny, and Erin toys with the idea of applying for a judgeship. Also, Frank is in a bind when mayoral candidate Katherine Tucker (Mary Stuart Masterson) accuses him of secretly investigating her husband, and Eddie faces her estranged father when he winds up in the hospital.