Well, isn't this a pleasant surprise! Maryse Lightwood, the former head of the New York Institute, is coming back to town for a visit on Shadowhunters Season 3 Episode 3.

Alec and Izzy's mother has had a bumpy relationship with her children, to say the least.

The Lightwoods toed the line between being a family and honoring their Clave duties. Though, her relationships with her children were turning around after she came to terms with her separation from her husband. But, could that peace come to an end?

Based on the preview photos below, there could be some troubling news. Maryse seems to be having an enjoyable dinner with Alec and his boyfriend Magnus at first, but things look like they go sour. What could they be discussing? Why do Maryse and Alec look so serious?

Check out the photos below from "What Lies Beneath," which airs Tuesday, April 3 on Freeform.

And don't forget, you can watch Shadowhunters online via TV Fanatic to get caught up on all the past action.

1. Maryse Lightwood Returns

Alec and Izzy's mother has dropped by New York City to have dinner with her children. Is this simply a mother wanting to see her children or could there be another reason up her sleeve?

2. Dinner Prep

Alec and Magnus want to throw Maryse a pleasant dinner now that she's back in town. Will the night be a success or will it cause more trouble for their strained relationships?

3. Mother's Approval

It's not secret that Maryse has never been the biggest fan of Alec and Magnus's relationship. But yet, she's strangely showing her son's boyfriend a lot of affection here.