"The heir to the human throne, Kamran falls in love with Alizeh, heir to the Jinn throne, who fulfills a long-foretold prophecy as being destined to free her people, a discovery that causes Kamran to question everything he's been taught about the Jinn and their future in his kingdom"--

In order to break a curse on her kingdom, Isla Crown, the young ruler of Wilding, must compete in the Centennial, a deadly game that only the rulers of six realms are invited to play, and to survive she must lie, cheat, and betray--even as love threatens to undo everything. Every 100 years the island of Lightlark appears. Its purpose: to host the Centennial, a deadly game that only the rulers of six realms are invited to play. The Centennial offers...

Sworn enemies Safire and Eris journey from the port city of Darmoor to the fabled Sky Isles in an effort to track down Asha, the last Namsara. From the port city of Darmoor to the fabled faraway Star Isles, their search and their stories become woven ever more tightly together as they discover that the uncertain fate they're hurtling toward just may be a shared one -- in this world and the next.

"At King Alaric's urging, Molly sets off on a quest for a magical loving cup (a goblet that binds people together), and her journey leads her to the hidden city of her ancestors, which proves to be as dangerous as it is mysterious"--

While Coryn and his companions journey to a wintery realm where mysterious owls live, the king becomes the target of an assassination plot.

Young King Jaron has had nothing but trouble with his advisors and regents since he ascended the throne of Carthya, and now King Vargan of Avenia has invaded the land and captured Imogen--and Jaron must find some way to rescue her and save his kingdom.

Young King Jaron has taken the throne of Carthya, but after enemies attempt to assassinate him, and a neighboring kingdom threatens invasion, he finds that he has no friends in the palace, not even his bride-to-be, princess Amarinda--and his regents think it would be better for Carthya if he just disappeared again.

My twin sister is the true queen of Aryd. She survives, hiding and clinging to life in the desert, while I reign as the false queen alongside the monstrous King Eidolon. There's only one escape from this gilded prison: Reven. My Shadowraith. My heart. Only the shadows that he struggles to control are growing more sinister, more powerful.
It's just a matter of time before they turn on him...and on me.
Even escape doesn't mean true freedom,

...

As plague ravages the overcrowded Earth, observed by a ruthless lunar people, Cinder, a gifted mechanic and cyborg, becomes involved with handsome Prince Kai and must uncover secrets about her past in order to protect the world in this futuristic take on the Cinderella story.

"With tensions rising between the kingdoms of Westria and Austlind, Molly and Tobias accompany King Alaric to Cortova, where he hopes to form an alliance with the powerful King Gonzalo--an alliance that would be sealed by Alaric's marriage to Gonzalo's daughter, the beautiful princess Elizabetta"--