He was a “Grand Master” of horror and rats were one of his specialties.

British horror writer James Herbert, whose best-selling spine-tinglers included “The Rats” and “The Fog,” has died at age 69.

Herbert’s publisher, Pan Macmillan, said he died Wednesday at his home in Sussex, southern England. It did not disclose the cause.

The London-born Herbert studied graphic design, print and photography before finding work at an advertising agency.

His first novel, “The Rats” — which depicted London being overrun by mutant flesh-eating rodents — took 10 months to complete and was published in 1974. It sold 100,000 copies in three weeks and was later turned into a film.

He went on to write 23 novels, selling 54 million copies around the world.

Most recent bestsellers included “Nobody True” and “The Secret of Crickley Hall,” which was turned into a three-part series for BBC television that aired in December.

Jeremy Trevathan, Herbert’s editor for ten years at Macmillan, said Herbert had the “rare distinction” of seeing his novels deemed classics of the horror genre within his lifetime.

“It’s a true testament to his writing and his enduring creativity that his books continued to be huge bestsellers right up until his death,” Trevathan said in a statement. “His death marks the passing of one of the giants of popular fiction in the 20th century.”

Herbert was named an Officer of the Order of the British Empire, or OBE, by Queen Elizabeth II in 2010 — the same year he was named “Grand Master of Horror” by the World of Horror Convention.

He is survived by his wife Eileen and three daughters.