Beachcomber Enemy by Stephanie Queen

If someone wants him dead, Dane figures why not accommodate them?
Private Investigation partners Dane Blaise& Shana George barely escape the attempt on their lives. Dane insists they need go on the run as ghosts to track down their killers. It’s the best way he knows to protect Shana from harm.
Shana is uneasy with the plan. Something doesn’t feel right about it, as if their killer knows they’re alive and Dane & Shana are playing into his hands. Should she defy Dane’s plan?
They need to find out who is out to get them. Dane assumes it’s an enemy from his past.
But could it be an enemy from Shana’s past with a score to settle…