June 23, 2017 at 09:21 AM EDT

With the Jace-Clary-Simon love triangle still in full swing on Shadowhunters, there’s a very big development coming its way. As fans of the book know, the visit to the Seelie Queen will throw a wrench in one of the romantic relationships of the triangle, and it’s all happening very soon.

EW has an exclusive sneak peek at Monday’s episode, which sees Clary and Jace getting ready to visit the Queen when Simon decides he wants to tag along. Unsurprisingly, Jace isn’t particularly excited about the idea of Simon coming along, but when he won’t take no for an answer, Jace isn’t left with much of a choice. Watch the two of them duke it out in the clip above.

Shadowhunters airs Mondays at 8 p.m. ET on Freeform.

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