Ralph's non-verbal autistic classmate Daniel, who relies on him for help to communicate, goes missing during their school field trip. Scorpion searches for him only to see on security video a suspicious man took Daniel's voice tablet, mistaking it for his intended dead drop, his tablet is linked to the international mercenary ring S6. The team races to track Daniel before them but arrive too late and then must save a panicked Daniel, who reveals that he opened a file on the wrong tablet, detailing an assassination plan to use smart bullets to take out a candidate running for Senate, which they stop. Toby visits amused psychopath Mark Collins in prison to ask him about Happy's husband but only gets a riddle, which he finally figures out: Happy's husband is Walter, purely to help Walter get a green card but she is pregnant and wants to divorce Walter.
—KGF Vissers