A recently released promotion trailer for episode 21 of Grey's Anatomy's ninth season gives some insight into the April 25 episode and leaves fans wondering what will Miranda Bailey's future with the hospital entail.

Bailey will face an investigation by the Center of Disease Control after some of her patients died of unexplainable infections and in the trailer for Thursday's episode, Sleeping Monster, some of the doctors question where their allegiance lies.

The board members of Grey-Sloan Memorial Hospital express their opinions in the matter, along with some of the other doctors.

"We need to stand by our doctors!" Meredith Grey said, supporting Bailey not long after the latter revealed that Grey testing positive for more than one genetic marker for Alzheimer's.

Richard Webber, however, tells head of the board Jackson Avery, "It's not the hospital, it's one doctor."

Avery might be against Bailey, though, since the promo video begins by him yelling, "Our patients are dead!"

All signs point to Bailey being responsible (she was the only doctor to care for all three patients) and she seems worried about what will happen next. She says in the video, "They think I did something wrong!" as her hand is being swabbed, perhaps as part of the CDC investigation.

The video's voiceover states that the situation will "turn friends on each other." April Kepner is the video yells, "Everything has been ruined because of you!" and Owen Hunt screams, "What the hell happened?" However, it is unclear of their remarks are in connection to the investigation.

ABC released a full synopsis for the upcoming installment:

"Bailey finds herself at the center of a CDC investigation surrounding the death of several of her patients, as Jackson and the rest of the board members argue over how to address the crisis with the public. Meanwhile, Cristina teases Alex about his unspoken feelings for Jo, and Owen continues to take special care of Ethan as the condition of his parents remains uncertain."

Catch the next new episode of Grey's Anatomy on Thursday, April 25, 2013, at 9 p.m. ET/PT on ABC.