FBI-agent Don Eppes (Rob Morrow) har et hemmelig våpen i sin yngre bror, Charlie (David Krumholtz), et mattegeni som bruker ligninger til å løse forbrytelser.
Don and the team investigate the secret world of alternate reality games after a man plunges to his death while participating in one such game. Amita's life is in danger when her hidden gaming ability becomes the key to tracking down the killer.
S4E407 40 min
