Which of the following well-known novelists wrote 'Caravan to Vaccarès'?

'Caravan to Vaccarès' is a novel by author Alistair MacLean, originally published in 1970. This novel is set in the Provence region of southern France. The novel was originally written as a screenplay for producer Elliot Kastner.

The plot is based on the premise that from all over Europe, even from behind the Iron Curtain, gypsies make an annual pilgrimage to the holy shrine of their patron saint, Saint Sarah, in the Provence region of southern France.

But something is different about this year's gathering, with many suspicious deaths. Cecile Dubois and Neil Bowman, a British agent, decide to investigate.

Eavesdropping, Bowman discovers that a man named Gaiuse Strome is financing the gypsies, and his suspicions on the real identity of Strome centre on a highly wealthy aristocrat, distinguished folklorist and gastronome, Le Grand Duc Charles de Croytor, whose girlfriend Lila Delafont is a friend of Cecile. As they follow the caravan, Bowman and Cecile find that their lives are in danger many times in an effort to uncover the secret the gypsies are so determined to hide, and before long are running for their lives.

Alistair Stuart MacLean (21 April 1922 – 2 February 1987) was a Scottish novelist who wrote popular thrillers and adventure stories. His works include 'The Guns of Navarone', 'Ice Station Zebra' and 'Where Eagles Dare' – all three were made into popular films. His books are estimated to have sold over 150 million copies.