In the fall of 1924, occultist and New Hampshire native, Benjamin Franklin Wentworth comes into possession of an ancient text which appears to show that the tomb of the man who inspired the legend of Merlin the Magician is located somewhere in the White Mountains of New Hampshire. He assembles an eclectic crew, including the mysterious Professor Hecate Ní Fidelma, a reputed witch, and sets off in search of the tomb. However, their plans go awry. Unsure whom she can trust, Hecate sets out on her own and goes into hiding. Pregnant and alone, she is in desperate need of help. But someone suspects her secret and has found where she is. And they are interested in more than just an old book...