Rookie Blue Season 4 continues this week with Episode 9, What I Lost, and a sneak preview video teases at what occurs when Chris returns to the precinct.

It won't be a happy reunion with Chris' old family at 15 Division, as the day takes a 360-degree turn when his son, Christian, is kidnapped on Andy and Nick's watch. As the squad goes on the hunt for the missing kid, Sam must face Nick and Andy's new relationship.

Last week's episode ended with Nick revealing his true feelings for to Andy, but she told him she needed more time to think.

Meanwhile, as the officers discover clues as to who kidnapped Christian, Chris is slapped with a stunning revelation that could tear his family apart.

The video below shows the moment where Andy leaves Christian by himeself, before he's kidnapped.

"I'll be right back, ok bud," Andy tells Christian as he is strapped in the carseat.

When Christian's mother confronts Andy on her leaving Christian, she responds, "just for a minute, I thought he'd be okay."

When Sam learns that it was Andy and Nick who were left responsible for Christian, his anger escalates. Nick defends Andy for her mistake, but Sam has his own agenda.

"She's my partner," Nick tells Sam.

Sam responds saying, "Not right now."

"Why are you making this personal," Andy asks Sam in the video.

Rookie Blue stars Missy Peregrym as Andy McNally, Gregory Smith as Dov Epstein, Charlotte Sullivan as Gail Peck, Enuka Okuma as Traci Nash, Travis Milne as Chris Diaz, Peter Mooney as Nick Collins, Ben Bass as Sam Swarek, Priscilla Faia as Chloe Price and Rachael Ancheril as Marlo Cruz. Matt Gordon, as Oliver Shaw and Lyric Bent, as Frank Best, also star in the series.

The show airs on Thursdays at 10 p.m. on ABC.

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