This Friday night brings to "Hawaii Five-0" Season 7 viewers an intriguing episode that revolves around a murder case related to the illegal practice of shark finning, and a Nazi war criminal who is found to be hiding on the island in an old leprosy colony.

Episode 15 of "Hawaii Five-0" titled "Ka pa'ani nui" holds an interesting storyline as Five-0 finds out during the investigation of a murder case that a Nazi war criminal might be hiding out in an old leprosy colony in Hawaii, claims Spoilers Guide. The case is related to the illegal practice of shark finning and it is during the investigation that the team stumbles upon the possibility of uncovering the war criminal.

Notably, the case is unprecedented in the history of the CBS police procedural drama. Neither has a Nazi criminal ever made it to the series nor has one served as a key story point. However, now that the unexpected is expected, viewers are all excited to watch the episode that will take them to World War II era, claims Carter Matt. It would be interesting to watch how the team deals with the Nazi criminal as they stumble upon him while probing a murder.

Also, viewers are looking forward to find out about Alex O'Loughlin and the remaining cast but it does not look like one has much information to satisfy one's curiosity. The Australian-American actor has already announced that he would not be returning after Season 7 and Masi Oka has also given his last performance. Last but not the least, there is still no word from CBS about the revival of Season 8.

So, where does that leave the fans? Well, they can pin their hopes on the current season that has been drawing more viewers and has also registered a rise in ratings. It signals positive news for the next season and though viewers are likely to miss two of their favorite characters, it goes without saying that the new cases will be exciting enough to hold their attention. "Hawaii Five-0" Season 7 Episode 15 titled "Ka pa'ani nui" airs on Feb. 3 on CBS.