The French Girl: A Rex Dalton Thriller

Rex Dalton and his best friend, Digger, the former military dog, are looking forward to a trouble-free holiday on the idyllic islands of Vanuatu in the South Pacific Ocean. Swimming, playing on the beach, fishing, and hikes. Nothing but the laid-back lifestyle for the two of them.
Then Digger introduces Rex to a beautiful French girl, not once, but twice. Soon, Rex and the girl become good friends. Then she disappears, and Rex is accused of having something to do with it.
Thus, begins a series of dramatic and life-threatening events with international repercussions with Rex, Digger and the French girl in the center of it.