Danny and McGarrett investigate the murder of an Oahu University professor whose body is found decomposing in a tub of acid and his boss, his teaching assistant, and a student who he busted for cheating are all viable suspects.

For the first time in television history, a primetime drama will allow viewers to choose the ending of an episode in real-time when CBS's HAWAII FIVE-0 lets fans vote on CBS.com or Twitter during the East and West coast broadcasts, Monday, January 14, 2013, on the CBS Television Network. 

On the eve of an election, the Governor asks 5-0 to discreetly investigate the murder of a prostitute found in the bed of a missing Congressman. Meanwhile, Danny goes to court to determine if he will get partial custody of Grace.