After their parents' death, Javi Cisneros and his little brother, Nico, move from their home in Puerto Rico to live with their Tití Amparo in northern California. As Javi struggles to adapt, he becomes increasingly worried by Nico's new imaginary friend, Hamish, and by the mysterious happenings that appear to threaten his family. Javi soon discovers that Hamish is not imaginary but a real ghost! With the help of his friend Willo, Javi battles with poltergeists and psychokinesis as he works to unravel a long-unresolved crime. But time is quickly running out--can Javi rid his family of the supernatural forces before someone is hurt?