Silent Witness — Patricia H. Rushford

Jennie McGrady thinks her vacation is doomed when a bomb threat delays her flight to the dolphin research lab in Florida. But then she meets Sarah, a girl who desperately needs her help to solve a two-year-old murder, and Jennie's detective instincts tell something is very wrong.

Sarah Stanford has lived in silence since her father's death. Now she's beginning to remember what happened the night of his murder but what if the wrong person finds out she's a witness?

Scott Chambers is a young, hot-headed environmentalist who teams up with Jennie in the Florida Keys. Unfortunately, Jennie soon finds out he has more than just a passing interest in the case.

Danger lurks just below the surface...