In ancient Rome it was whispered that the great philosopher Plotinus could project his soul into another human being in a ritual that hinged on a kiss. In present-day Delphi, California, the sole remaining guardians of the Plotinus Ability hide in plain sight as members of the exclusive Oculus Society - until their leader, Octavia Harris, is killed in her own home. With no leads on the case, Octavia’s daughter, Gretchen, vows to find her mother’s murderer at any cost. One piece of the puzzle falls into place when Gretchen’s best friend, Jessica Shaw, discovers the Plotinus Ability. Skeptical but curious, the two can’t resist trying the ritual - but they’re not alone.