No. 1 Sunday Times bestselling author of Fourth Wing, Rebecca Yarros, sends readers on a nine-month cruise where everyone has to keep their head - and hearts - above water.

She's the only woman he wants, and the only one he can never touch again.

She's Penna Carstairs. AKA, Rebel. Named FMX-treme Magazine's sexiest female athlete of the year - there's no rule in extreme sports she hasn't broken, no gender barrier she hasn't demolished.

She's the mysterious stranger I met in a bar, the one I spent one insane, incredible night with. And now I'm screwed. Or rather... not screwed.

Because the woman I can't get out of my head is the one woman I can never touch again. I'm Dr. Cruz Delgado - the youngest professor on campus.

And Penelope Carstairs just walked into my class.