After some unexpected life detours, Callie Lewes is determined to complete her PhD program and figure out what to do with the rest of her life. Her laser focus is finely tuned and she's ready for total immersion in literature, subpar student essays, and all the joys that come with being a graduate teaching assistant. She has no time for, or interest in, anything else. Especially not dating.

Even if Callie were to entertain the idea of dating, she's certain it would be with someone vibrant, open, and close to her own age. Definitely not someone like Dr. Kate Jory, a new member of Pennbrook College's English department. Kate is both intimidating and a closed book. And the age difference between them is not small. But Kate is also brilliant and fascinating, and Callie is drawn to her in ways she'd never imagined possible.

Not that Kate notices. Or does she? Callie can't tell. Even though they develop an engaging and flirtatious friendship, Callie struggles to work up the courage to put herself directly in Kate's romantic path—wary of the type of fire she suspects their sparks could ignite.