Dorothy Dunnett is one of my favourite writers. It is hard to describe her books without them sounding much worse than they are. I spent two months in 2002 obsessed to the point of mania with her fourteen book epic historical romance cycle (not really my genre). And her Dolly books are the cleverest, subtlest and best-written detective thrillers I know. They are not well-served by their covers. Here is a fullish collection.
Above is the exception. The one truly good cover any of the books has. Most of the books were reissued with different titles when Dolly and the X Bird made them look as if they were something they weren't. The reissues are boring but, in the context of a tube, acceptable. So, Bird of Paradise is the same as Tropical Issue.
Ah, I don't have a copy of boring-covered Roman Nights / Starry Bird. Here's a picture of one from a different series of these books - the only series I don't own a cover of. They're not bad, actually. I would definitely be allowed to read them on the tube.