When Dason Williams' body is discovered in his mother's basement it looks like suicide. But evidence links him to the World Tree Girl, a Jane Doe murder victim identified only by a full body tattoo of a world tree. Paranormal Investigator Maureen Keslyn suspects that a dangerous paranormal known as The Medusa is behind both deaths.

Problem is – nobody knows how to neutralize the Medusa – or how to even find it, as the creature is capable of invisibility. The case is complicated by the ghost of Maureen's former partner. Phil not only refuses to cross to the other side, he's become a beacon attracting a storm of unquiet spirits which are wreaking havoc with the residents. Things go from bad to worse when his much-too-alive daughter Jillian shows up to claim her father's ashes – and take charge of the Manor while she's at it.

Maureen and the team enlist unlikely allies as they race to contain the spirits and neutralize the Medusa before everybody in the Manor winds up dead – or worse.