An unconventional science fiction series: the story isn’t linear, the books don’t follow each other in sequence, the tech is laughably low on some worlds, then mysteriously high on others. The hero used to be the most evil entity in the Sigma Sector and the heroine, despite her magnificence, would rather hide away in a dusty library. The alien enemy – once it’s determined there is an enemy – cannot be seen and the invasion takes so long that no one notices for several centuries. Several characters appear to be angels but the only real angel has no wings. The complexity of what is real and what isn’t confuses the most intelligent character. What is regarded as real is false if you are Fleet, yet what is real to the Fleet cannot be perceived by anyone non-Fleet. Immortality is the strongest theme yet no one – except the mindwalkers – can remember and the prevalent church is called SPIT. Metaphysics, religion and supernatural existentialism aside, the Fleet Quintet is essentially a love story with strong characterisation.