How Elizabeth Olsen and Robbie Arnett’s Experiences With Anxiety Inspired Their Children’s Book (Exclusive)

The author couple has released their second children’s book, “Hattie Harmony: Opening Night.”

The Avengers Actress Elizabeth Olsen and her musician husband of three years, Robbie Arnett, hope to teach children how to manage anxiety.

The couple’s new children’s book, Hattie Harmony: Opening Night (after their first bestseller Hattie Harmony: Worry Detective) offers young readers tools such as journaling, taking breaks, and introspection. Both books are illustrated by Marissa Valdez.

“Lizzie and I went for a walk and we brainstormed together to create this character of Hattie Harmony,” Arnett, 31, tells PEOPLE in this week’s issue. “We both wanted a Hattie when we were younger.”

As for her own experiences with anxiety, Olsen, 34, says hers began to manifest in her early 20s. “I had panic attacks when I was 22 and really thought there was something wrong with me,” she says. “They’re pretty terrifying when they happen. I’ve learned games to stay in the present and not go around in circles. I’ve also been doing yoga since I was 17. Luckily, I felt like I had tools.”

Arnett admits to growing up “a very anxious kid, and my family moved around a lot,” he says. “I never really felt rooted anywhere, and I had all sorts of fears. It helped me to develop Hattie and really focus on that and think about the child in me.”

Working together has come easy for the duo. “It’s really funny because I had this instinct that was like, ‘Oh, I don’t know, how are we going to do this?’ But honestly, our whole relationship is built on communication,” Olsen says. “Obviously, you hope that’s the case in most relationships, but it’s really easy and enjoyable for us to problem-solve.”

Arnett “is a very imaginative and creative person,” the actress continues. “And I obviously have a creative career, but I really like to solve type-A puzzles. So while he comes up with a lot of ideas, I figure out how to structure the format. How do we turn that into a language that we can learn from a child behavioral psychologist? How can we use that language and still make it fun? That’s how we find the balance.”

“Every writer needs a good editor,” Arnett adds. “I feel like it’s the yin and yang of our journey.”

Hattie Harmony: Opening Night is now on the shelves.

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