What about this one?

[imaptone]

The raiser seems to be decent Vp of 20% PFR 10%. The cold caller is an unknown, who just sat down. I think the hand is standard until the river. Maybe not. Opinions?

Party Poker 15/30 Hold'em (8 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Preflop: Hero is BB with J/images/graemlins/spade.gif, T/images/graemlins/spade.gif. CO posts a blind of $15.
<font color="#666666">2 folds</font>, <font color="#CC3333">MP1 raises</font>, <font color="#666666">1 fold</font>, CO (poster) calls, <font color="#666666">2 folds</font>, Hero calls.

Flop: (6.66 SB) 3/images/graemlins/spade.gif, 4/images/graemlins/spade.gif, T/images/graemlins/diamond.gif <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, MP1 calls, CO calls.

Turn: (4.83 BB) 8/images/graemlins/spade.gif <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, MP1 folds, CO calls.

River: (6.83 BB) K/images/graemlins/diamond.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">CO raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">CO caps</font>, Hero calls.

Final Pot: 14.83 BB

[Stuck]

Looks standard to me. You sure look beat when he caps, but I think the three-bet is fine. You haven't played your hand obviously like a flush, so he could be raising with as little as AK.