99 cutoff Raise call in front of me.

[Malifous]

PokerStars 0.25/0.50 Hold'em (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is CO with 9[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/heart.gif[/img].
<font color="#666666">4 folds</font>, <font color="#CC3333">MP2 raises</font>, MP3 calls, Hero calls, <font color="#666666">2 folds</font>, BB calls.

Flop: (8.40 SB) 5[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, <font color="#CC3333">MP2 bets</font>, <font color="#CC3333">MP3 raises</font>, Hero folds, BB folds, MP2 calls.

Turn: (6.20 BB) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
MP2 checks, <font color="#CC3333">MP3 bets</font>, MP2 folds.

Final Pot: 6.20 BB

All villains unknown since i only have few hands of them, when i got the hand and raise call infront of me i thought i was calling for set value. Hmm, overall pretty confused. how should i play it and how read dependant is it?