Villian is unknown. What to do?

Noble Poker 0.10/0.20, hand converted by the iPoker Converter at Talking-Poker

saw flop | saw showdown

Button ($18.83)
SB ($7.43)
BB Hero ($26.79)
UTG ($17.75)
UTG+1 ($9.63)

Preflop: Hero is in the BB with Q Q
UTG raises to 0.80, 2 folds, SB calls 0.70, Hero raises to 2.40, UTG raises to 4, 1 fold, Hero ????