Let us start with the book’s first and second aims, to develop our understanding of defences in both private law and unjust enrichment. In this regard, the editors’ introductory chapter stands out. It is, of course, a helpful guide to the other contributions in the book. But, far more than an orientation exercise, it raises interesting questions germane both to answers to unjust enrichment claims and answers to claims in general. One example is offered here. It seems that there is a distinction between arguments that negate the claimant’s cause of action (denials of liability) and those that concede a good cause of action but otherwise reject the imposition of liability, whether partially or in full (defences