The Williams family just can't stay out of trouble.

'Hawaii Five-0' Season 6: Catherine Rollins' Name Is Back In The Mix In A Worrying Sneak Peek

Danny (Scott Caan) found himself behind bars last season, his brother's financial woes caused him to flee the country, and soon the detective's mother will find herself entangled in an FBI investigation.

Clara will return to Hawaii Five-0 for Feb. 19's "Ke Koa Lokomaika'I (The Good Soldier)," and as teased by a previous photo, Mrs. Williams (Melanie Griffith) will find herself in an interrogation room.

'Hawaii Five-0' Season 6: When Will The Series Return? New Valentine's Teasers

"While Danny's mother is questioned by the FBI, McGarrett partners with a young man with autism who may have information to help solve the murder of his only friend," CBS teased.

Can Danny get to the bottom of his mother's problem, or will the FBI prove to be a bigger problem than the cop anticipated?

While we wait for the answer, Hawaii Five-0 will bring viewers a special Valentine's Day episode on Feb. 12 (see a preview below). Take a look back at some of the team's worst dates ever with "Hoa 'inea." Airing less than a week after Super Bowl 50 halftime show, the episode will feature four songs from Coldplay.

Catch Hawaii Five-0 Fridays at 9 p.m. ET on CBS.

Tags: Hawaii Five-O television CBS