Love's Tangled Web — Ethel M. Comins

Sally Morrison get a fabulous chance to win a big bonus and study art in San Miguel, Mexico, when she becomes a special investigator and tries to find the missing young heir, Richard Eckert. She soon discovers a mysterious American who might be Richard Eckert. Then she meets the flamboyant guitarist, Ricardo Engle, who also bears a striking resemblance to the wealthy heir.

Sally's budding romance with an artist, Joe Santinelli, is threatened by her undercover mission, as Joe becomes jealous of Ricardo, with good reason! Even more jealous is the guitarist's tempestuous girlfriend, Lupe, who'll use any means -- even violent means -- to keep Sally away from Ricardo and a successful end to her secret assignment.