Rysa Walker

When Kate Pierce-Keller’s grandmother gives her a strange blue medallion and speaks of time travel, sixteen-year-old Kate assumes the old woman is delusional....

It's never wise to talk to strangers...and that goes double when they're dead. Unfortunately, seventeen-year-old Anna Morgan has no choice....

Decoding an ancient message that survived the destruction of Mars could be the key to avoiding the same fate for Earth in this action-packed sequel to The Cold Light of Stars.

A teacup, a diary, and a body at the foot of the stairs.... When Ruth Townsend’s job and marriage both end abruptly, she heads home to the mountains for a fresh start....

Nine heiresses are missing in Gilded Age New York with no ransom demand. Journalist Miriam Cole's sister was the first to vanish twelve years ago. The only connection? They all attended the exclusive Pembroke School.

A chamber from an ancient civilization is uncovered deep below the surface of Mars. Science reporter Claire Echols is assigned to cover the story, but someone is determined to stop her....

Kiernan Dunne abandoned his family ties to help Kate fight the Cyrists, and he's never regretted that for one moment....

When Ruth Townsend discovers Tessa Martin’s body in an abandoned factory, sprawled across a Ouija board, she does the responsible thing and calls 911. But by the time Sheriff Blevins arrives, the girl’s body has vanished....

Struggling with evolving psychic abilities, seventeen-year-old Anna Morgan and her equally exceptional friends are on the run from the ruthless Graham Cregg....

To stop her sadistic grandfather, Saul, and his band of time travelers from rewriting history, Kate must race to retrieve the CHRONOS keys before they fall into the Cyrists’ hands....

The Cyrists are swiftly moving into position to begin the Culling, and Kate's options are dwindling. With each jump to the past or the future, Kate may trigger a new timeline shift....

The United States’ past is hijacked in a time-warping adventure of future interdimensional, high-risk games by the bestselling author of the CHRONOS series....

CHRONOS historians Madi, Tyson, and Katherine and their cohorts are on the enemy’s trail, fixing the mess that sociopath Saul Rand has made of history - and of the Temporal Dilemma rules....

When two time-traveling historians cross paths during one of the most tumultuous decades of the twentieth century, history goes helter-skelter. But which one broke the timeline? In 2136 Madison Grace uncovers a key to the origins of CHRONOS....

Eighteen-year-old Anna Morgan is on the run from the very government project that created her abilities. Now they seek to weaponize the gift she doesn’t want and can’t control....

Simon Rand's life isn't exactly linear, but he's okay with that. He was older than his mother when they first met, and he's traveled pretty much everywhere the CHRONOS key can take him....

Adesso che i Ciriani sono a un passo dal realizzare il loro terrificante e apocalittico progetto, le opzioni a disposizione di Kate sono...

Per fermare il sadico Saul e la sua banda di viaggiatori nel tempo impegnata a riscrivere la Storia, Kate Pierce-Keller deve essere pronta...

A familiar blip of green light in the corner of his room has Kiernan Dunne hoping the new arrival is Kate, so that he can abandon the rescue he's planning....

Human cloning. Technology evolves faster than we do. The law shields us from our worst temptations. But the opportunity is there, dangling just out of reach - perfection and ascension or delusion and destruction. The choice is ours....