Rysa Walker

In the final book of The Icarus Code, Mars is one giant step closer to life outside the domes, but the fate of both worlds lies in the hands of Tobias Shepherd, a disillusioned cult leader. He thinks Earth is beyond hope, but still believes he can save the chosen few he has brought with him to Mars.

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. Resting on a park bench, touching the turnstile at the Metro station - she never knows where she'll encounter a ghost. These mental hitchhikers are the...

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. Worse, the loyalties of those around her - including the allegiances of Kiernan and the Fifth Column, the shadowy...

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....

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. If she jumps back in time and pulls the wrong key - one that might tip off the Cyrists to her strategy - her...

A simple blink is all it takes to yank Pru from the car with her dad into a world of hurt. She awakens in 2305 to find herself pinned under what's left of CHRONOS headquarters....

With a madman in control of the timeline, one wrong move could be the last for time travelers intent on stopping him in this mind-bending novel by the best-selling author of the CHRONOS series. CHRONOS historians Madi, Tyson, and Katherine and their cohorts are on the enemy’s trail, fixing the...

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

As the Vanderbilt Ball approaches, a series of unexplained earthquakes have New York City on edge. Miriam's attempts to understand their cause lands her in the place she least wants to be.

The adventure continues in SLIPSTREAM the second book of the IMPROBABLE Trilogy, a new historical fantasy thriller from the author of The CHRONOS Files.

A psychotic killer hijacked her mind and her body. She’s taking them back. 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: the invasion of her mind and her body...

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. History is turned inside out when off-world travelers challenge Tyson Reyes and Madi Grace to a real-life game of Temporal Dilemma. Three...

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....

When the rusted-out remains of a vehicle with a unique vanity plate are hauled out of the Freedom River, journalist Ruth Townsend and her best friend, Wren Lawson, think they’ve finally learned the truth about the disappearance of their high school friend, Tanya Blackburn....

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.

From the bestselling author of the Chronos series comes an enthralling novel of time travel, fast-paced action, and history-changing events. When two time-traveling historians cross paths during one of the most tumultuous decades of the twentieth century, history goes helter-skelter. But which...

2013 Winner—Amazon Breakthrough Novel Award—Grand Prize and Young Adult Fiction Winner. 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. But it all becomes horrifyingly real when a...

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....

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....

What if your mind became your worst enemy? Struggling with evolving psychic abilities, seventeen-year-old Anna Morgan and her equally exceptional friends are on the run from the ruthless Graham Cregg, leader of a covert operation known as the Delphi Project. Cregg has already killed repeatedly...