This is an Inspector Wallander novel by Henning Mankel. Wallander is feeling his age and fears he is losing his edge. Three young people are shot while having a woodland midsummer picnic, dressed in wigs and costumes of the 18th century. The bodies had been buried, then several weeks later recovered, and the picnic scene re-staged.
The police department is missing one of their own (due back from vacation) who is found shot to death in his apartment. Was his vacation spent delving into the young people’s disappearance? Wh0 sent postcards, indicating the trio was on a trip? Why was the fourth of the trio not at the picnic?
Wallander has these flashes of insight that are just out of reach of meaning anything until a few chapters later. He is always sleep deprived and in this book he is on his way to becoming a diabetic. He really needs to take better care of himself – unless Mankel intends for the series to end. I liked this book – could have used a little more editing.