Three boys.

Two murders.

One terrible choice.

Friends, lovers, enemies, I've found them all at Bevington College. I've survived the worst that my family, an angry fae prince, and a rampaging Fate could throw at me.

Just when I had everything I wanted, I was thrown forward through Time and cut off from the source of my magic.

Can I get back to Charlie, Gabe, and Darwin?

What will have happened to my boys in my absence?

And how in the Nine Hells am I going to pass my Early History of Magic exam?

Meet the quaternion ...

Publisher's Note: Quaternion is a college-aged, MMFM, whychoose romance. This is the third book in the series and is not a standalone. Teddy's Boys and Gabe's Girl should be read first. Quaternion ends the trilogy. This book is intended for mature readers only.