Vagabond Hearts — Bobby Hutchinson

Paradise ...
Billy Reece and her mother-in-law were delighted to win a trip to Hawaii. After their husbands were killed in an accident, neither woman had ever expected to see much sunshine again. And they certainly never thought that a mix-up in their accommodations would mean spending time with a group of vagabonds.

... and peril
When Detective Cosmo Antonelli was assigned to a murder case in Kailua-Kona, posing as a hobo, the last thing on his mind was meeting someone like Billy. She was so beautiful--and so vulnerable. She needed security, someone she could count on. Cosmo knew he had to let her go, but circumstances were drawing them inexorably together.