Section 1: Delusions: Theoretical, historical and lived perspectives Chapter 1. Delusional Beliefs and the Madness of Crowds: What are beliefs and why are some of them pathological? Chapter 2. The Lived Experience of Strongly Held Beliefs Chapter 3. Considering Delusions through a Cultural Lens Chapter 4. The psychology of paranoid beliefs Chapter 5. Linguistic techniques for clinicians working with clients with delusions Chapter 6. The Curious Case of Schreber Section 2: Treating Delusions: types, techniques and settings Chapter 7. Assessing delusions Chapter 8. Collaboration not collusion: Normalizing and befriending Chapter 9. CBT for Paranoia: conceptualization, process and techniques Chapter 10. At Risk Mental State: Delusional presentations Chapter 11. Erotomania and sexual delusions. Chapter 12. A bizarre and grandiose delusion: persecution of a goddess using social media and microbots. Chapter 13. Who Are You? -Capgras and Other Delusions of Misidentification Chapter 14. Thought disorder or a problem with communication? Chapter 15. Trauma and delusions Section 3: Working with delusions in different settings Chapter 16. Cognitive Behavioral Therapy for delusions within Japanese culture Chapter 17. A CBT approach to working with delusions in forensic settings Chapter 18. Using Digital Health Technology to Facilitate Measurement-Based Care in the Treatment of Delusions Chapter 19.CBT-informed skills training for families caring for a loved one with delusions Chapter 20. Decoding Delusions: Demonstration of Key Skills for working with unusual beliefs