Catching Her Rival (Harlequin Super Romance Book 1986)

Let the games begin… 

Allie Miller's life is a little crazy at the moment. She just found out she has a twin sister, she's been working day and night to get her PR business off the ground, and now her heart's decided to fall for her biggest professional rival, Jack Fletcher. 

But Allie is used to life's challenges and intends to face this one—this very handsome, very charming one—head-on. However, when Jack suggests they be just friends, Allie is thrown for a loop. Lusting after the competition is one thing, but being his pal is nearly impossible…especially when she realizes she wants much more.