Biographical Notes on the Portraits at Hinchingbrooke is an interesting book written by Mary Louise Boyle about the impressive collection of portraits at Hinchingbrooke Castle. The author describes each portrait in detail, revealing the history and characteristics of the persons depicted on them. The book is an important source of knowledge about the British aristocracy and their relationship to art. Through this work, the reader can better understand and appreciate the value of this unique collection of portraits in a historical context.