Composer George Benjamin and librettist Martin Crimp have already had two major successes on the main stage of the Royal Opera House. Written on Skin, which appeared at Covent Garden in 2013 and 2017, may now be the most frequently performed opera written in the twenty-first century, and it was followed by Lessons in Love and Violence in 2018.  Benjamin and Crimp’s first collaboration, however, was a chamber opera entitled Into the Little Hill in 2006, and it is to this...