"Residential Mortgage Investment (2025): Behavior Modeling and Application" by Nick Krsnich is an in-depth exploration of mortgage behavior modeling, specifically focusing on loan prepayment and loan loss models. It highlights the importance of understanding behavioral modeling, mortgage right servicing valuation, and RMBS security valuation for financial analysts in the mortgage industry. The book offers practical insights on predicting and valuing loans, dealing with risk management, and applying behavioral modeling techniques to improve pricing and loan management decisions. The author's extensive background in mortgage investment, including previous work with Countrywide Financial, lends authority to the content, making it essential for mortgage executives, analysts, and managers.