Hawaii Five-0 Season 4 Episode 12: Sneak Peek Video [Spoilers]

(Best Possible Screen Grab/CBS)

Hawaii Five-0 season 4 returns with new episodes, beginning on Friday night at 9 p.m.

In the episode, “O kēlā me kēia manawa (Now and Then),” McGarrett helps Grover investigate his friend’s disappearance after he apparently commits murder.

The sneak peek for the episode shows Grover getting impatient with Grover while investigating the disappearance. Grover has become a esries regular.

Meanwhile, Kono continues her search for Adam.

In the last episode that aired, Chin was kidnapped by a serial killer, while Danny helped a father find a connection with his late daughter.

Chin ends up saving himself in time, killing the killer in the process.

And Grace and Danny take a box they found on the beach to the man who was the father to the box owner, in Japan.