Hanging Hill
Two long-estranged sisters find themselves in interlocked novels: one in a police procedural, the other a thriller. A caper threatens to break out. One problem for the plot, it seems to me, is that it assumes a senior British detective today would think that her having worked for a few months in a strip club, fifteen or twenty years ago, would be a terrible secret, that if her colleagues knew, that would end her career.
But, suspending disbelief, this formal experiment in mystery fiction has real depth and imagination and a remarkable conclusion.