Rysa Walker

The Flock has unleashed a wave of targeted attacks on research facilities across Earth and the terraformed areas of Mars. But are they the enemy or one of Claire’s few potential allies in saving Earth?

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....

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....

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

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

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....

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.

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....

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....

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....

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.

Leah Pfeifer has spent two years in an isolated cabin in Colorado with her almost three-year-old daughter, Anna, trying to protect the girl both from her inherited psychic ability and from the government organization that would be happy to exploit it....

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 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....

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....

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....

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....

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....