Sure enough, the TV series is inspired by the book. The frame of TV episodes shows the outline of the work of SAWYER: loss of collective knowledge, vision, announced death of one of the characters ... But the comparison stops there: it is indeed an adaptation (free) of the novel.
Reading is easy, the style is quite nice: it may however regret a swim a bit pompous.
Without a doubt, the thread will keep you spellbound from start to finish.
A beautiful work of SF ... that will distract your last days of summer.