Demetri and Mark have a little chat. Frost has done the near-impossible: dropped out of our national surveillance system in 1990 and stayed gone. There's not a single visual record of him anywhere. Mark is playing with a chess piece and he pegs Frost as both thorough and a poor sport ("He likes people to know when he's winning"). He then tells Demetri what he's been up to: looking through chess club memberships from the 1980s. Through these, he's determined that one of Frost's old chess foes was a San Franciscan named Ian McKinnon. McKinnon had been the reigning amateur chess champ until Frost beat him. Mark says he traced McKinnon and called him, "but when I mentioned Frost, he hung up." Maybe he doesn't like rehashing old losses? Rather than speculate on whether the precognitive evil genius might have threatened McKinnon, Mark decides to show Demetri the computer simulations from the Frost/McKinnon matches. Frost used a gambit called the "queen's sacrifice" and it is characterized as "a total Hail Mary, but it's one of the most effective plays of the game." Mark theorizes that Frost knew the FBI would see these games, and he was sending them a message from 1991. With a few keystrokes, Mark: 1. calls up the tournament game sheets; 2. shows Demetri that each move takes either two or four seconds; 3. deduced that these values correspond to Morse code dots and dashes; and 4. found a phone number for a prepaid cell. "He really did know the future," Mark says. Unless Frost flashed onto the entire third season of The Wire when the police were trying to get warrants for the burners (prepaid phones)... I'm not buying it. It was a phone number. Anyway, Mark calls and gets Frost's smug voicemail: "Well done. Leave a message." Mark leaves a similarly humility-impaired response: "This is Agent Benford. It's your move." Oh, well done, Mark, taunting the time-traveling evil genius!

Anyway, Mark and Demetri are off to San Francisco.

And now the B-plot commences. It's Keiko! She's hanging out in the restaurant where she expects to meet Bryce someday. She and the waitress have a Japanese/English conversation lightly touching on Keiko's money troubles and the fact that she doesn't have a work visa. The waitress is like, "Our sushi joint is hiring," but Keiko says sweetly that she didn't come to Los Angeles to sling shiro maguro. (Although if she were really feeling rebellious, she should take the job, get a few Polaroids snapped, then anonymously mail them back to her parents.) She's here for a new beginning. "And a new love," the waitress adds knowingly. As the door opens, Keiko's eyes go to it, but the handsome devil striding in isn't the man in her flashforward. Indeed. He won't be showing up until April 29th. So... why sit in the restaurant until then?