IP Accidents. By Patrick Goold. [Cambridge University Press, 2022. xvi + 133 pp. Hardback £85.00. ISBN 978-1-10-884148-1.]

connected? Both are cases of merely notional attribution with much in common. The authors note this is an open question (p. 245) but do not evaluate the normative merits of each position or the possible outcomes. Chapter 8 sets out the bars to tracing. Most are uncontroversial so the treatment is short, but the book is an end-to-end treatment. The most controversial question is whether change of position ought to be a bar. This is left for another work since the authors, through their justifications for tracing, reject the applicability of the principles of unjust enrichment. The new Law of Tracing certainly achieves its goal to set out just that. In doing so, it strikes a balance between having a grand explanatory theory from which all the rules and principles deductively flow and a more flexible theory formed inductively from the authorities. My criticism that it could have been pushed further towards the former is tempered by the advantages of the latter. Indeed, the law of tracing is not fully formed, so characterising it as precisely as possible, but not too precisely, is a fine objective. And in Chapter 5 this compromise was deployed to particularly good effect. This leads us to the final questions: Will the new Law of Tracing be the last word on the subject? Plainly no. Will it assist our understanding of the law and drive it forward? Plainly yes. Its clarity, attention to detail and insightful analysis makes it a valuable addition both to the academic debate and the practitioner’s toolbox.