http://www.imsdb.com/scripts/Godfather-Part-II.html
No one knows how to google. The hymen roth plot was only in the films, not the novel. Roth was pretty insidious; not only did he try to kill Michael, send him to Prison, made his own brother betray him, but he also tried to Bankrupt Michael's funds and keep him out of the deal (only found in the script). So that part when Roth says the 2 million never got to the island and the next scene where Michael is pacing around looking tense (it's because Roth actually intercepted the courier who took the 2-3 million that was skimmed off the top of a corleone casino and stole that shyt straight up from him). Also Questadt's revelation as a paid politician belonging to Roth is more devastating as the script makes clear that Michael knew that he was being investigated prior to going to Cuba, so he invited all the politicians along with Questadt to join in the festivities in the hopes of bringing them to his side; the fact that Fredo knew all about this while entertaining Questadt makes more sense while Michael disowned him on the spot. Other than that, there are some good scenes where Michael becomes increasingly paranoid about traitor and even calls home asking for the money to be sent (not knowing it was intercepted) and gets Rocco on the line; he's so paranoid he hangs up immediately. Also we see a good scene between Tom and Neri where it's clear Neri would do anything for Michael, which is why Rocco probably got kicked to the bushes and assigned to assassinate Roth. Some more interesting things that make the plot more coherent are also found. Just check it out.