Unbreakable Hostage by L.E. Harvey

Lareina Oliveira; high school math teacher, she wants to share her passion for math. So it is back to school for Lareina...a tough Ph. D. program. A classmate is captivated by Lareina's beauty and intelligence, and despite her repeated refusals to his attentions, he kidnaps her! Only her determination and wits can save her... Will her family, roommate, and a wily detective from Missing Persons get to her before it is too late?