Rhodes' The Making of the Atomic Bomb is deservedly regarded as a classic, but Dark Sun doesn't live up to the same standard [1]. For people interested in the technical history of the H-bomb, Anne Fitzpatrick's PhD thesis Igniting the Light Elements: The Los Alamos Thermonuclear Weapon Project, 1942-1952 is as good a single-document source as I've ever read:
https://www.osti.gov/biblio/10596
[1] Some reasons for the difference discussed here: https://old.reddit.com/r/nuclearweapons/comments/wr2pav/why_...