[16] The second book in The Locked Tomb, Harrow the Ninth, was published in August 2020,[17] and was a finalist for the 2021 Hugo Award for Best Novel.

[21] After completing The Locked Tomb, Tor will be publishing Muir's cyberpunk western novella trilogy, beginning with Go Marching In.

[22] In 2019, Amazon editors selected Gideon the Ninth as the best science fiction and fantasy book of the year.

[23] In 2020, Amazon named Harrow the Ninth one of the best science fiction and fantasy novels of the year.

[24] In 2022, Kirkus Reviews named Nona the Ninth one of the best science fiction and fantasy novels of the year.