100NL Line check with TPTK facing turn raise

[nogenius]

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
8 players
Converter

Stack sizes:
UTG: $93.05
UTG+1: $39
MP1: $38.25
MP2: $152.90
CO: $77.80
Hero: $98
SB: $49
BB: $25.85

Pre-flop: (8 players) Hero is Button with A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img]
3 folds, MP2 calls, CO folds, <font color="#cc0000">Hero raises to $4</font>, 2 folds, MP2 calls.

Flop: Q[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/club.gif[/img] ($9.5, 2 players)
MP2 checks, <font color="#cc0000">Hero bets $9</font>, MP2 calls.

Turn: 9[img]/images/graemlins/heart.gif[/img] ($27.5, 2 players)
MP2 checks, <font color="#cc0000">Hero bets $18</font>, <font color="#cc0000">MP2 raises to $45</font>, Hero ???

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I have only 5 hands on MP2 showing that he is a 27/0. He's an unknown.

What's your move here?

What kind of PT numbers would you need to consider taking it to the felt on the turn?