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It's summer in Adders Fork. The sun is out, the sky is blue and things are going swimmingly for Rosie Strange. The Essex Witch Museum has been relaunched with a new Ursula Cadence wing and picnic grounds. Then developers roll into the sleepy village to widen the road. When the centuries-old Blackly Be boulder, said to mark the grave of a notorious witch, is moved, all hell breaks out. Within hours a slew of peculiar phenomena descends and, when a severed head is discovered atop the boulder, the locals storm the Museum to demand someone take action. Can Rosie and Sam unravel the mystery? And what of the ancient treasure that could drastically change someone's fortunes and offer a motive for murder?