Garnett receives information that one of the eight passengers on a flight to Athens has been poisoned and will die before the plane reaches its destination.

Garnett wonders who is double-crossing whom when he gets involved with five Middle East notables and some very valuable jewels.

Delaney, on a visit to South America, finds himself involved in the aftermath of a small revolution.

Delaney has reasons to believe the saying "Diamonds Sing Louder Than Nightingales" when Garnett sends him to Teheran to investigate the disappearance of some valuable packages of gems from the registered mail.

Delaney's holiday on the idyllic Caribbean island is rudely interrupted when he finds it is in the direct path of Hurricane Hilda - and there is only one small plane to fly everyone out.

An ex-bootlegger decides to tell all he knows to a Congressional Crime Committee. To stop him, his old associates kidnap his granddaughter.

Garnett has reason to believe a murderer has stowed away in the nosewheel housing of a freight plane bound for New York. But murderer or not, the man's life is in danger.

Garnett goes to West Germany to investigate a report from an ex-Luftwaffe General that planes are landing at a disused airfield. Is the General imagining things, or is there really a mystery to be solved?

A sick man, suffering from loss of memory, is identified as the wealthy Ian Denning, believed lost in the South American jungle three years before. But his wife does not recognize him - is he an imposter?

A deserted airfield - a plane with stolen gold - and in the hut the tea is still warm in the teapot. This is the mystery Delaney has to solve when he flies to the emergency landing strip in the African bush.

Film star Didi Druson receives a number of mysterious threats telling her she will "never see twenty-five". Although he suspects a publicity stunt, Garnett agrees to fly to Vienna with her on the eve of her twenty-fifth birthday.

Has the music teacher really lost her hearing because of the roar of jet aircraft? Inspite of the expert's opinions, Garnett still has his doubts.