'The Laws of Restitution' by Robert Stevens has been published by OUP

The Laws of Restitution by Professor Robert Stevens has recently been published by Oxford University Press.  In it he argues that there is no unified law of restitution or unjust enrichment. Instead, there are seven or eight different kinds of private law claim, depending on how you count them, which have nothing important in common one with another that have been grouped together by commentators.