Elise Morley, professional time traveler, makes her living in the past. At the Place in Time Travel Agency, her job is to ensure that the Ten Essential Rules of Time Travel are adhered to and that clients who run into trouble on their historical vacations can make it safely back to the present where they belong. On one such assignment, Elise travels to 1899 Colorado Springs, where a client wanting to take in the cleansing mountain air inadvertently allows the Place in Time's technology to fall into the wrong hands. It's up to Elise to take it back before the secrets of time travel are uncovered a century too soon.

Elise Morley is an expert on the past who's about to get a crash course in the future. For years, Elise has been donning corsets, sneaking into castles, and lying through her teeth to enforce the Place in Time Travel Agency's ten essential rules of time travel. Someone has to ensure that travel to the past isn't abused, and most days she welcomes the challenge of tracking down and retrieving clients who have run into trouble on their historical vacations. But when a dangerous secret organization kidnaps her and coerces her into jumping to the future on a high-stakes assignment, she's got more to worry about than just the time-space continuum. For the first time ever, she's the one out-of-date, out of place, and quickly running out of time.

When Dr. Wells, the head of the Place in Time Travel Agency, learns that someone's trying to track down the ancestors of his star employee, there are few people he can turn to without revealing her secrets. But who better to jump down the timeline and rescue Elise from being snuffed out of existence generations before she's born than the very person whose life she saved a hundred years in the future? But Juliette Argent isn't an easy woman to protect. The assistant to a traveling magician, she's bold, fearless, and has a fascination with time travel, of all things. Can the former secret agent Chandler, with his knowledge of what's to come, keep her safe from harm and keep his purpose there a secret? Or will his presence there only entangle the timeline more?

Cass is a 22nd century university student who – like most young adults – has always believed her parents were a bit stuck in the past. But on her eighteenth birthday she learns exactly how true this is: not only are her parents time travelers, living in an era different than either was born in, but now, to ensure that history plays out as it's supposed to, she must travel to the year 1914 to live out her adult life. Cass isn't the type, though, to just sit back and watch while all the tragic events she's learned about in her history courses play out in front of her. Not when she's the only one in the world with the foreknowledge – and determination – to change it. The Cassandra Complex is the third novella in the Place in Time series, which began with The Continuum and The Grandmother Paradox.

Dodge Greenley is tired of being the go-between for his time-traveling family. All he wants is for them all to be able to live together peacefully in one era—is that too much to ask? But after breaking all the Rules of time travel in a desperate attempt to retroactively free his parents from the threat of the secret organization his father worked for a hundred years earlier, Dodge makes a startling discovery. It turns out there's someone else stalking his family up and down the timeline, and this time, the menace may be coming from within the Place in Time Travel Agency itself. Enlisting the help of his 22nd century coworker, Dodge sets off to the year 1915 to rescue his sister from a threat that might have originated at any point in their past, present, or future, proving once again that the greatest threat to time travelers is other time travelers.