Last week on "The Young and the Restless," Paul told Dylan that Marco may have killed Austin and Courtney, and Harding may be his accomplice. Dylan said that he'd go and check on Harding. Sharon was not happy about this, but Dylan said that he needed to do this to get some answers. 

At the park, Summer remembered something after she heard Harding's ring tone. Noah and Marisa arrived just as Harding left. Summer told them that Harding was at the cabin the night Austin was killed. 

At the Club, Hilary told Neil that she knows that he's up to no good. He took offense and said that he's not there to cause trouble. Hilary didn't believe him and said that Nikki shares her concerns. He said that he was going out of town, and Hilary apologized.

Lauren helped Hilary, and the two wondered why Colin was there when Jill was out of town. Colin said that he wouldn't miss Hilary's wedding for anything. Later, Lily confronted Colin about blackmailing Devon, and Colin said that if she exposes him, then she'd be exposing Devon as well. 

At the wedding, Devon stopped the minister from speaking and said that he had something that he needed to say to Hilary. After a pause, he said that she looked beautiful and he was proud to be marrying her. When the minister asked if anyone objected, someone arrived. 

Here are "The Young and the Restless" spoilers from Aug. 17 to 21:

Monday, Aug. 17: Devon and Hilary's wedding takes a surprising turn; Michael reaches out to Lauren; Kevin backs Harding into a corner.

Tuesday, Aug. 18: Ashley tells Billy that she knows Jack is hiding something; Phyllis wonders if she and Jack should tell Paul the truth; Phyllis and Nikki have a confrontation; Marisa decides to take matters into her own hands.

Wednesday, Aug. 19: Victor shares news that surprises members of his family; Lily and Cane come to a decision about their marriage.

Thursday, Aug. 20: Marco and Jack face off; Noah wants justice for Courtney; Hilary's world is upturned.

Friday, Aug. 21: A deadly showdown occurs; Sharon decides to confront Summer and Mariah; Phyllis decides to seek revenge.

"The Young and the Restless" airs from Monday to Friday at 12:30 p.m. on CBS.