The Crossing Places by Elly Griffiths

In this gripping mystery, forensic archaeologist Dr. Ruth Galloway is drawn into a complex investigation when the bones of a child are discovered on the desolate salt marshes of Norfolk. Initially believed to be the remains of a girl who vanished a decade ago, the bones turn out to be much older, but the case takes a chilling turn when another child goes missing. As Ruth collaborates with the enigmatic Detective Chief Inspector Harry Nelson, she finds herself entangled in a web of ancient rituals, local legends, and modern-day secrets, all while confronting her own personal challenges and the haunting beauty of the landscape that surrounds her.