villain is completely utterly unknown

Full Tilt No-Limit Hold'em, $6 BB (6 handed) Full-Tilt Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($600)
UTG ($631.50)
Hero ($600)
CO ($600)
Button ($204)
SB ($275.40)

Preflop: Hero is MP with Q, A.
1 fold, Hero raises to $21, 3 folds, BB calls $15.

Flop: ($45) 3, J, 6 (2 players)
BB checks, Hero bets $30, BB calls $30.

Turn: ($105) A (2 players)
BB checks, Hero bets $78, BB calls $78.

River: ($261) 7 (2 players)
BB checks, Hero bets $201, BB raises to $471 (All-In), Hero folds.

Final Pot: $393