Nasty spot: KK in a reraised pot with 3 callers

[criminaldave]

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

Button ($101.50)
<font color="#C00000">Hero ($97.40)</font>
<font color="#C00000">BB ($97.75)</font>
UTG ($106.40)
<font color="#C00000">MP ($100)</font>
CO ($43.90)

Preflop: Hero is SB with K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">UTG raises to $4</font>, MP calls $4, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $16</font>, BB calls $15, UTG calls $12, MP calls $12.

Flop: ($64) 5[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero ? </font>

what is the optimal play here?

BB has just sat down and i have no history.
UTG player is bad. Not horrendous, just bad. Heads up he isn't getting away from 99-QQ, but four handed he might.
MP is a multi tabler. He runs at 22-17. He can spew real bad at times but will get away from a marginal hand. He most probably is set mining.. Indeed, all three of them may be set mining. What is my play here?