When Mahesh Sidana - butterfly collector and founding member of an elite IQ society - is found murdered, pinned to a wall in a manner akin to his treasured butterfly specimens, DCI Barnaby and DS Winter are thrust into a crime that impacts not only on their community, but internationally. With the help of an old friend, can they catch the culprit before another victim is found?

DCI Barnaby gets to relive his former days of sporting glory when a death at the local Rugby Club sends Barnaby and DS Winter into a muddle of rucks, old grudges, romance… and artisanal chocolates?