VIDEO: First Look - This Week's Season Premiere of ROOKIE BLUE

A group of young and ambitious rookie Cops continue to navigate the emotional trials and tribulations of their professional and personal lives. After three years on the job, these rookies are well on their way to becoming experienced officers, but at what cost? It's been six months since Andy McNally and Nick Collins left for their undercover operation. But while they were gone, everything seems to have changed at 15 Division, on the Season Four premiere of "Rookie Blue," THURSDAY, MAY 23 (10:01-11:00 p.m., ET), on ABC. Check out a first look below!

In the season premiere, "Surprises," Andy and Nick continue to work undercover infiltrating a meth pipeline. However their covert mission goes sideways when Nick - then Andy - go missing. Meanwhile, a random arrest at 15 Division puts Sam Swarek and the other officers in The Middle of the drug investigation-turned-rescue operation. Finally, Andy must figure out how to cope with the transformation of her own life as well as those of her friends at the station and continue to do the job she loves.