Her Guilty Secret (Harlequin Comics‪)‬

One day, a suspicious-looking man comes into Kate's private detective agency.  He tells her that he wants her to find his missing wife.  He promises her an extraordinary fee if she can infiltrate and conduct a search of a famous ranch owned by the prime suspect, Alex Kellerman.  Alex's wife also died under mysterious circumstances.  The moment Kate sets eyes on Alex, his pointed gaze takes her breath away.  But Kate quickly warns herself to come to her senses.  "No matter how sexy his eyes are, you can't fall for him!  There's a possibility he's responsible for the death of two women!"