Unholy Island is a tidal island in the North Sea more remote and more magical than the famous Holy Island — protected by ethereal wards maintained by Esme Gray, a witch sheltering from her own dark past. When Luke Taylor arrives searching for his missing twin and breaks the island's two-night visitor rule, the close-knit community is forced into an uncomfortable reckoning. A murder on the shore makes everything more urgent.

Esme Gray is a capable, caring ward witch who has retreated from the wider world after a painful past — she is warm with the islanders but deeply guarded with strangers. Luke Taylor is tenacious and grieving, willing to break any rule to find his twin. Their dynamic is slow-burn opposites-attract built on genuine respect.

Across three books, Esme and Luke grow from wary strangers to reluctant partners in both investigation and romance as the island's supernatural nature — and its many residents' secrets — slowly unfolds. The series blends cozy murder mystery with urban fantasy magic, building a full portrait of a magical community that readers have called their favorite fictional home.