The Conspiracy of Us Series by Maggie Hall

Avery West's newfound family can shut down Prada when they want to shop in peace, and can just as easily order a bombing when they want to start a war. Part of a powerful and dangerous secret society called the Circle, they believe Avery is the key to an ancient prophecy. Some want to use her as a pawn. Some want her dead... moreAvery West's newfound family can shut down Prada when they want to shop in peace, and can just as easily order a bombing when they want to start a war. Part of a powerful and dangerous secret society called the Circle, they believe Avery is the key to an ancient prophecy. Some want to use her as a pawn. Some want her dead. To unravel the mystery putting her life in danger, Avery must follow a trail of clues from the monuments of Paris to the back alleys of Istanbul with two boys who work for the Circle — beautiful, volatile Stellan and mysterious, magnetic Jack. But as the clues expose a stunning conspiracy that might plunge the world into World War 3, she discovers that both boys are hiding secrets of their own. Now she will have to choose not only between freedom and family — but between the boy who might help her save the world, and the one she's falling in love with. less

Two weeks. That’s how long it took for Avery West’s ordinary life to change forever: In two weeks, she discovered she was heiress to a powerful secret society known as the Circle, learned her mother was taken hostage by the Circle’s enemies, and fell for a boy she’s not allowed to love, just as she found out another was her unwelcome destiny... moreTwo weeks. That’s how long it took for Avery West’s ordinary life to change forever: In two weeks, she discovered she was heiress to a powerful secret society known as the Circle, learned her mother was taken hostage by the Circle’s enemies, and fell for a boy she’s not allowed to love, just as she found out another was her unwelcome destiny. Now, Avery crosses oceans in private jets to hunt for clues that will uncover the truth about the Circle, setting her mom and herself free before it’s too late.  By her side are both the boys: Jack—steady, loyal, and determined to help her even at the expense of his own duty—and Stellan, whose connection to Avery grows stronger by the day despite her best intentions, making her question what she believes at every turn. 
But at the end of a desperate hunt from the islands of Greece to the red carpet at Cannes comes a discovery that not only changes everything, but could bring the whole world to its knees. And now Avery is forced to face the truth: in the world of the Circle, no one is what they seem. less

The Circle is hers. But Avery West has lost everything else: her mother, the family she’d just found, and the one boy she trusted. In their place are unfathomable power, a staged relationship that makes her question every real feeling she’s ever had, and a mission to find the cure to the virus that’s made her own blood a weapon. Then disaster strikes, turning Avery, Stellan, Jack, and Elodie into the most wanted people in the world... moreThe Circle is hers. But Avery West has lost everything else: her mother, the family she’d just found, and the one boy she trusted. In their place are unfathomable power, a staged relationship that makes her question every real feeling she’s ever had, and a mission to find the cure to the virus that’s made her own blood a weapon. Then disaster strikes, turning Avery, Stellan, Jack, and Elodie into the most wanted people in the world. To clear their names and the growing rift between the families of the Circle before the world dissolves into World War Three, they’ll have to make a desperate, dangerous final race for Alexander the Great’s tomb. What they will find inside will mean the world’s salvation—or destruction. Avery will have to decide how much she’s willing to sacrifice—for the world, for family, and for love—in this conclusion to the Conspiracy of Us series. less