If the wraith is in melee range then Franklin strikes with his sword. If not then he waits for it to advance. Balbo and Drogo can't really do anything useful, so they stay back out of harm's way will fire silver sling bullets, if they are able! (edit) I forgot Balbo and Drogo have silver bullets!
Balbo and Drogo are standing by to hurl their flasks of holy water as a readied action. Franklin draws his sword and steps in front of Aldbane (to protect him while he is casting the light spell).
If Aldbane's search does not bear fruit: Franklin remembers from last time that the secret door opened when we went east. So he checks the east exit of the room, maybe there is a pressure plate or mechanism that opens the door? He methodically paces the area, deliberately stepping on each paving sto...