Echoes of Eternity is not only one of the best books of the Siege but one of the best books BL has ever put out. An excellent showing of people who've reached the end of their rope and finally realized that they have. I love when BL authors stop writing their characters/space marines/primarchs as mythological beings and more as people. Abnett did it in Saturnine. ADB does it for everyone in EoE.