By Breia Brissey
September 26, 2013 at 02:30 PM EDT

Endless, the fourth and penultimate book in Jessica Shirvington’s Embrace series, hits U.S. shelves Oct. 1. It’s a fun, action-packed series that hasn’t received a ton of attention, but it’s highly addictive and perfect for YA fans. (Hence my slight obsession.) Here, we’ve got the exclusive first look at the trailer: “I have been a huge fan of all of the trailers that have been produced in the U.S, but this one especially sends a shiver up my spine,” says Shirvington. “I think it captures so much of the feeling of the book—not an easy thing to do in under a minute!” Check out the video after the jump, and then read on for a chat with Shirvington about the book and the conclusion of her Embrace series. Warning: minor spoilers ahead!

ENTERTAINMENT WEEKLY: How would you tease Endless?

JESSICA SHIRVINGTON: Endless is a tear you down kind of book, but in the right ways (hopefully). It is also a story of Violet’s growth and capabilities. She comes face to face with so many big things in Endless. She is forced to become a real warrior but she does so much more. And the people around her who love her show that they are all worthy to stand by her side. Lilith has been returned to the world, and she is taking children who are destined to one day become Grigori warriors as her captives. Violet, Lincoln, and Phoenix are all tested to the max and in the end discover just how much they are willing to put on the line, and how much they might lose.

When we last talked you said you cried a lot while writing Endless. Now that I’ve read it, I can confirm it’s definitely heartbreaking. (I may have shed a tear or two.) Why was Endless so hard to write?

It was the culmination of so many events from the previous books. So many of the story threads led to the events in Endless, and as a writer I knew I’d been setting many of them up for quite some time. I always knew what I had to do…. It broke my heart to pen the scenes that needed to happen. There was one scene that really broke me, and it involves Violet being shot with a number of arrows, and she is counting them as they hit her. It was gut wrenching to do that to her.

I remember sitting at my computer and crying my heart out while I wrote pretty much the final 10 chapters, and my husband would walk by and see me. The first few times, he’d do a double take and panic, kneeling down beside me and asking me what was wrong, to which I hiccupped and stuttered through enough gibberish for him to realize it was about the book. After the first few times he adapted, until he’d simply just pop his head in my office, register the full-blown breakdown, nod, and leave me to it. That said, I wouldn’t have had it any other way. Endless doesn’t fit into the stereotype, and that was important to me as a writer. I was adamant it would not to fall into cliché territory. And I feel I can confidently put it this way: there is no neat little bow on this book.

Where do the characters—and specifically Violet—go from here?

I don’t want to say too much at this stage, but after the events of Endless let’s just say that there are some seriously unresolved issues and raw emotions that need to come to a head. Violet’s relationships with both Lincoln and Phoenix become more complicated and intense than ever. Violet’s story right from the beginning has been about choice and consequence, and it continues to be exactly that. One thing that Violet definitely knows is that consequence can be very punishing. In Endless, Violet’s is left feeling she has no choices left, but not all the characters feel the same way or agree with her decisions.

What can you tease about the final book, Empower? And when will it be released in the U.S.?

Empower will be released in the U.S. in April or May 2014. I am so excited about the final book. Again, I suppose it is bittersweet but I am ready to give these characters their ending. I can’t reveal too many details at this point, but I will tell you that Empower actually starts two years after the final scene in Endless. The extra two years was something I’d always wanted to provide and it creates a fantastic new dynamic. As a writer, it was a lot of fun to work with. The tension between some of the characters (hint hint) is extreme and Violet is no newbie anymore. Plus, you can expect to see quite a bit of Gray—a character that was first introduced to the series in Emblaze who adds a new dimension to the story. And of course, there is a new, ultimate, big bad and he is there to test the absolute limits of not only Violet’s power, but also of her angel maker and the future of our world…. In Empower, people get hurt and people die. I just hope that readers will feel that it is the right ending.

There have been talks about a TV adaptation of the series. If that happens, who would you dream cast to play Violet, Lincoln, and Phoenix?

I always like the idea of someone like a Lyndsy Fonseca or even Emma Roberts for Violet. As for Lincoln, someone like Chace Crawford or Alex Pettyfer.  And for Phoenix…I really don’t know. A lot of people suggest Ian Somerhalder, and I do admit that he has definite elements of Phoenix, but I will always see him as Damon from Vampire Diaries. In the end though, if it ever makes it all the way to the screen, I would love to see a cast of unknowns. Actors that become known for playing the parts of these characters rather than being known for other roles.