Shadowhunters Season 3 Episode 17 Review: Heavenly Fire

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Isabelle sends Simon on an undercover mission on Shadowhunters Season 3 Episode 17, that unveils more than either one of them could have imagined. 

With every moment putting Simon deeper into danger, Isabelle enlists Aline's help to put a stop to Operation Heavenly Fire once and for all. 

Related: Shadowhunters Season 3 Episode 16 Review: Stay With Me

But before we dive in, don't forget that if you're behind on the show, you can watch Shadowhunters online right here at TV Fanatic.

Romantic Evening - Shadowhunters Season 3 Episode 17

Simon, or "Zeke Russo," ran into more than one surprise during his time in the facility. 

Raphael's presence was unexpected, but thankfully it gave Simon the ally he needed to get to the bottom of what's really going on. 

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Considering that the facility appeared as if it was a kill shelter, turning Downworlders back into humans was the last thing the audience could have seen coming. 

While they're not killing anyone, does this make what Aldertree is doing okay?

Not only was he keeping the prisoners in the dark about his experiment, but he was also planning on dumping his Heavenly Fire into the city's water supply and forcibly turning all Downworlders in the area human.

Thankfully, Aline and Isabelle arrested Aldertree, and Simon was able to put an end to his experiment from the inside. But he wasn't able to do it alone.

On Shadowhunters Season 3 Episode 17, the audience finally gets introduced to half Seelie, half Shadowhunter, Helen Blackthorn.

Fans of the books will know what an amazing character Helen is and how crucial she is to the story as a whole.

Obvious sparks were flying between her and Aline, so hopefully, viewers will get to see a romance between them start to blossom onscreen. 

But I admire you. Without you, there might not be a Downworld. At least, not in New York anyway.


Speaking of romance, we also have the Sizzy side of things.

Undercover - Shadowhunters Season 3 Episode 17

Despite Shadowhunters Season 3 Episode 17 centering around Simon and Isabelle's teamwork, it fell a bit flat in the Sizzy department.

It feels as if Simon and Isabelle aren't getting the buildup they deserve, especially considering that these are Shadowhunters' final episodes. 

Related: Shadowhunters: Will 'Sizzy' Get the Screentime They Deserve? Time is Running Out

They did share a cute scene or two, but it's reaching a point where that just isn't enough. 

You know, for a second I was worried you weren't going to make it out.


Shadowhunters has been implementing a common theme when it comes to both Simon and Isabelle's lives. Will they ever find the love they're looking for?

The show has been foreshadowing that their epic love is each other, but is there enough time to build to that?

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Even putting them in a relationship will feel rushed at this point, so it almost feels as if Shadowhunters doesn't have the time to go all out.

We have our fingers crossed for a miracle, but it's hard to believe that Simon and Isabelle will get the story arc they deserve when it's been postponed for so long already. 

Secret Mission - Shadowhunters Season 3 Episode 17

In other news, it was troubling just how easy it was to feel sympathy for Jonathan on Shadowhunters Season 3 Episode 17

Growing up in Edom with the mother of all demons is bound to factor into the nature vs. nurture side of things.

Jonathan was injected with demon blood against his will and raised by the queen of Hell, so it's not surprising that he turned out the way he did. 

Captive - Shadowhunters Season 3 Episode 17

However, it doesn't excuse all the horrible things he's done, and Clary knows this.

I'm sorry, Jonathan. I'm sorry. This is the way it has to be.


Granted, it is hard for Clary to see her brother in so much pain when the only thing he wants is her love even though he wants it in a peculiar and disgusting way. 

The characters may think that the Heavenly Fire will get rid of Clary's twinning rune, but we'll have to see it happen to believe it. We've got our fingers crossed.

Questioning - Shadowhunters Season 3 Episode 17

It's impossible to avoid discussing that Malec scene at the end of Shadowhunters Season 3 Episode 17.

Alec spent the entire day nervously preparing for his dinner with Magnus, but we weren't expecting the proposal to go down that night. 

Magnus is not in a good place, and it's perfectly valid. 

I lost my magic. Twice. And I'm just coming to terms with how useless I am without it.


Alec knew his boyfriend was torn up about losing his magic, but he didn't realize how big of a toll it took on Magnus mentally until he saw it firsthand.  

It was a heartbreaking scene in more ways than one.

It's disappointing that the plan Alec put so much work into got ruined, but it's impossible to blame Magnus for what he's currently feeling.

Dinner Plans - Shadowhunters Season 3 Episode 17

The bottom line is that Alec cares about Magnus above all else and will do anything he can to make him happy.

As usual, Alec gives Magnus every ounce of support he has to offer, even if it just means holding him while Magnus breaks down in his arms. 

Stray Thoughts: 

  • Isabelle and Simon's use of the Seelie rings was a nice callback from the books. 
  • Where's Maia? We miss her. 
  • Will Clary be able to hand Jonathan over to the Clave if they remove the twinning rune? Judging from her expression at the end of the episode, we're not too sure. 
  • Clary's visions of Jonathan as a child had nothing to do with the rune. Does their connection exist even without it?
  • It's evident that there's no one else in the world for Magnus Bane than Alec Lightwood, but is he in the right headspace to accept a proposal? Will Alec still think now is the right time to ask?

Alright Shadowhunters fans, what were your thoughts on Shadowhunters Season 3 Episode 17? Drop a comment down below and let us know!

Shadowhunters airs Mondays at 8/7c on Freeform. 

Heavenly Fire Review

Editor Rating: 4.5 / 5.0
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User Rating:

Rating: 4.7 / 5.0 (35 Votes)

Rachel Foertsch is a staff writer for TV Fanatic. Follow her on Twitter.

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Shadowhunters Season 3 Episode 17 Quotes

Help me! Someone please, help me!


But I admire you. Without you, there might not be a Downworld. At least, not in New York anyway.