Inclusion Criteria:  Age 18 - years Ability to give informed consent A schizophrenia spectrum disorder (ICD-10 code: F20 -F29) Green Paranoid Thought Scale total score ≥ 40  Exclusion Criteria:  Rejecting informed consent A diagnosis of organic brain disease IQ of 70 or lower (known mental retardation as assessed by medical record) A command of spoken Danish or English inadequate for engaging in therapy Inability to tolerate the assessment process