Pursuit of the Deadly Diamonds
 When Mr. and Mrs. Lane invited charming French woman Annette Reynaud to their brownstone for dinner with the family, they had no idea that she was a jewel burglar whose real name was Michelle, and that Mrs. Lane's younger brother Richard Duffy had known Michelle from his past. Richard privately warned Michelle from having any ideas about his sister's home, but she assured him she was retired, having come to USA to get away from those who demanded she work for them. Shortly afterwards though, he got a strange phone call from her hinting she was in trouble but could not speak freely. The clues she gave in her talk were 'nice', 'park' and 'au revoir'. That got Richard and his nephew Stephen Lane to fly to Nice, booked into a Hotel Parc and saw from binoculars that Michelle was on board a yacht named Au Revoir. Faking a chance meeting, Richard learned that Michelle was being compelled to stage a diamond heist for a gang, whose mastermind's name she was hoping to learn to trade with the police. They even got ready imitations for Michelle to replace the real stones during the heist. With no other recourse available, Richard and Stephen could only keep a close watch on Michelle while trying not to be discovered. Their only ally was the police inspector Armand Duval, who was only prepared to take a chance on their crazy story because there was really a gang of thieves operating in the area, having stolen some very precious stones. The gang was likened to a hydra, and so far, the police only managed to get hold of the lowly footpads but had no inkling about the mastermind.