They always have left the episode with you thinking what happened next, but in recent episodes its become a bit worse. Do you remember the one with the twins and franky found out the Doctor had killed the family to get reinstated. As for last night, I'm not sure but I think the last little bit with Boyd saying to Greta "When you found the Policeman, he was dead right" suggested that boyd was trying to find out if she had killed his as he (boyd) already knew her father had not killed him (or at least he specifically denied it). Not sure what was going on really, did she know he was killing the people or was she involved in killing them.