In 2018, a young forensic scientist, homesick and adrift in the North of England, is heading to a coroner's office to identify a body. But this body, found in a moss-layered bog, is not like any Agnes has ever seen: its bones prove it was buried more than two thousand years ago, yet it is almost completely preserved.

The body draws the attention of numerous groups with competing interests: archaeologists desperate to study the bog, those who want to profit from the land's resources, a group of neo-pagans who demand the body be returned to its resting place. And underfoot, all along, there's the land itself: a teeming colony of moss, with its own dark stories to tell.

As Agnes becomes tangled in controversies stirred by her own discovery, she must face the deep history of what she has unearthed. Equally alive to post-Brexit England and Europe at the dawn of the Roman era, Bog Queen connects across time two young women learning to harness their strange strengths in a rich, raw landscape more mysterious than either can imagine.