Cassandra Moon knows her mother Dora has a special talent - but will it be enough to protect the eccentric older lady when she is abducted in the depths of winter? Once again, Cass finds herself teaming up with DI Noel Raven, whom she argues with and is attracted to in equal measures. But the only way she and Noel can save Dora is to accept the bond of love that joins them together, so they can harness the power of the emerald ring and bring down the evil Constantine...