'Hawaii Five-0' Season 5 Episode 4 spoilers have revealed that Chin joins Danny while trying to release his brother Matt. The team also finds strange motives while investigating the murder of a hired assassin.

The synopsis of 'Hawaii Five-0' Season 4 reads, "When a Detroit hit man is taken out by one of his colleagues on the streets of Oahu, Five-0 is shocked to learn the killer's surprising motives. Meanwhile, Chin puts his career on the line to help Danny get the money he needs to save his brother's life."

In the next episode, which is titled as "Ka No'eau, the mystery associated with Matt, Danny's brother, will continue. According to reports from Cartermatt, "even though this is the fourth episode of the season coming up, there is still no concrete word on when or if Dane Cook is actually going to show up on the show."

Although, there has been no confirmation if Dane Cook, who plays the role of Matt will return, the story line of the show revolves around the fact that Danny has finally realized that his brother was being held hostage by Marco Reyes and wanted $18 million.

Latest rumors suggest that in the upcoming episodes McGarret has to help Jerry in order to escape from the custody of the people who have been tracking him.

Season 5 of 'Hawaii Five-0' is expected to be a highly dramatic season as viewers can enjoy 25 episodes this year.