There are 6 books in the Defining Gravity Series series. The newest book is Uprising which came out in 2026.

Astrid never breaks the rules; she’s much too terrified of her overbearing father to step out of line. He controls her weight, her friends, and even her career path. And he doesn’t approve of anyone in their family thinking for themselves.

When one impulsive decision ends in disaster, Astrid is…
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2
Flight

Book cover of Flight
Astrid doesn't argue when she's exiled to the wilds of northern Canada to stay on her long-lost aunt's ranch. It seems like as good a place as any for both her and Folly to heal after their horrific accident. Especially since Folly is angrier and more dangerous than ever.But life…

3
Freefall

Book cover of Freefall
Moving back to Vancouver Island with her new horse, Red, seemed like a good idea at the time but now Astrid is seriously doubting her decision. Her family is just as crazy as ever, her archery career is taking a path she doesn't like and her best friend Hilary is…

4
Riding Above Air

Book cover of Riding Above Air
Living on the Ahlberg’s country estate should feel like paradise now that sixteen-year-old Astrid is finally free from her overbearing parents. But instead, it’s just a lot of hard work. With Hilary still injured, Astrid has a full barn of horses to look after on her own, a failing archery…

5
Touching Ground

Book cover of Touching Ground
An invitation to prepare the Triple Hill’s horses for an upcoming mounted archery clinic seems like a dream come true to Astrid, Rob and Nori.It’s the perfect distraction Astrid needs to keep from worrying about her parent’s new baby and her own uncertain future.But the ranch is changing, for better…

6
Uprising

Book cover of Uprising
Astrid finally has everything she wants in life. She lives on a fantastic farm, is surrounded by horses, and has the world's best boyfriend. And, her goal of being an Olympic-level archer is closer than ever.

But when an unthinkable tragedy happens, Astrid is suddenly responsible for the little sister…