Novels
Marlowe also wrote nine novels and a fragment of a tenth. Alex Hamilton believes that "the notion of the successful man who loses his way is the key preoccupation in Marlowe's books."
He published his first novel A Dandy in Aspic in 1966. The idea for the book began when he travelled to Berlin on a Ford Foundation grant to attend a "colloquium on creative writing" with Günter Grass and Uwe Johnson. Marlowe wrote the books in four weeks while working as a clerk at National Benzole and struggling with a play that he'd been attempting to write. The book was a best-seller and was subsequently filmed. Spy author Alan Furst calls the book wonderful and terrific. Nicholas Royle cites the novel as the fifth greatest debut novel ever written, though adding that Marlowe would go on to write "even better novels". According to Alex Hamilton, the American and British editions have different endings owing to the American publisher's dislike for the protagonist's death in a car accident.
According to a 1976 interview, Marlowe believed that his 1969 novel A Single Summer With L.B.: The Summer of 1816 was his finest. In 1979 actor Robert Powell said that he intended to produce and star in an adaptation of the novel; Powell would play Lord Byron.
Marlowe returned to the world of espionage in his 1970 novel Echoes of Celandine which was subsequently filmed as The Disappearance starring Donald Sutherland.
Marlowe's 1972 novel Do You Remember England? is a semi-autobiographical work.
To research his 1975 supernatural novel Nightshade, Marlowe and his wife visited Haiti. There, Aubelin Jolicoeur – "a black dwarf dandy with a white suit and cane" – escorted them everywhere. The novelist Graham Greene had fictionalised Jolicoeur as Petit Pierre in his novel 1966 The Comedians. The novel ultimately took a year to write.
Despite his admiration for his earlier novel A Single Summer With L.B., Marlowe ultimately believed that his 1979 novel The Rich Boy From Chicago – another partly semi-autobiography work – was his finest and the "quintessence of all I have written."
Marlowe died before he could finish Black and White. A fragment appears in an anthology published by Nicholas Royle.
In a letter to an aspiring teenage writer, Marlowe wrote "Never think too hard about what you are going to write – just jump in. I've never known the end of my book, nor even the middle until after I am halfway through."
Nicholas Royle finds it baffling "that a writer of Marlowe's quality, his style and sensibility setting him apart from all competition, has been out of print for so long."