Something's rotten in the Fey lands. On both sides of the border, shadow creatures spring out of nowhere, and the dark legends surrounding the fey take on a whole new meaning. Marcus Bramble tracks a madman while Elizabeth and the crew at the Embassy sort through the evidence he left behind. But time is against them. The Fey rulers have turned a blind eye on forests teeming with imaginary monsters, and the Sidhe tower stands silent amidst the chaos. Will the race to uncover its secrets solve the mystery of the elves' past or unleash even more horrors on them all?