OK Jez, I'm putting him on JJ and am folding on the river. The raise pre-flop says to me that Dormouse wants to narrow the field down to 1 (at a push 2) players going to the flop. At this point, I would put the player on either a big pair, AK or maybe AQs (if they're aggressive)
OK, on the flop, AQ has missed and isn't the greatest board for either QQ or TT so Dormouse may have decided to take a free card.... or something else has happened to the strength their hand....
Three checks on the turn and that K may give a clue to what Dormouse has. AK would have bet the flop i'm pretty sure so trip K is unlikely. AA would have also bet the flop so I think we can rule that out as well. A second check by Dormouse tells me that he has either nothing or a MONSTER. With your lonely 33 at the moment, it seems an easy check/fold upto now.
But wait, a 3 on the end fills you up! You bet for value, but now Dormouse comes out firing. Two hands now enter my mind, KK and JJ. Either is possible, but I'm just slightly going for JJ due to it being more feasable than quad K.
How close am I Jez?
Edit: A check on the flop is also slightly safer due to the rainbow board and the texture of it