Looking for heart-racing romance and breathless suspense? Want stories filled with life-and-death situations that cause sparks to fly between adventurous, strong women and brave, powerful men?   Harlequin® Romantic Suspense brings you all that and more with four new full-length titles in one collection! SHIELDING COLTON'S WITNESS (A The Coltons of Colorado novel) by Linda O. Johnston US marshal Alexa Colton is assigned to take care of Dane Beaulieu, a vice detective testifying against his partner's murder by a corrupt police chief. Their nine-hour drive becomes a many days' journey as they elude attackers who want them both dead. Despite escalating danger, the chemistry sizzles between them!   KILLER IN THE HEARTLAND (A The Scarecrow Murders novel) by New York Times bestselling author Carla Cassidy When widower Lucas Maddox needs a nanny for his three-year-old daughter, he hires local woman Mary Curtis for the job. As they grow closer, Mary is threatened by a mysterious person and murders begin occuring in the small town. Lucas is determined to protect her, but can he let go of the past that holds him hostage?   HIS CHRISTMAS GUARDIAN (A Runaway Ranch novel) by New York Times bestselling author Cindy Dees Ex-SEAL and holiday hater Nicholas Kane is no saint. But he and sexy CIA agent Alexander Creed must find a priceless nativity crèche his boss stole and return it before Christmas. Between double-crossings, rogue agents and their own guarded hearts, these spies will need a holiday miracle to find love—and survive!   SIX DAYS TO LIVE by Lisa Dodson It took sixty days for Dr. Marena Dash to fall in love with ex-soldier Coulter McKendrick, who’s been injected with a lethal poison, but if she doesn’t find an antidote, she’ll lose him in six! After a bitter breakup and time apart, he shows up on her doorstep near death and with a trail of people wanting him silenced. Can Merena find the medicine he needs before the clock runs out?