A Midsummer's Equation by Keigo Higashino

When a retired Tokyo police detective, Masatsugu Tsukahara, is found dead in Hari Cove, the police wonder who would have murdered him in the small ocean town. Tsukahara was attending a hearing about a corporation seeking approval to mine precious metals off the coast of Hari Cove. Local resident Narumi Kawahata, whose parents own the Green Rock Inn that Tsukahara was staying at, is very involved in the campaign to stop the mining operation. Another guest at the inn is physicist Manabu Yukawa, who is consulting for the corporation. Yukawa, also known as "Detective Galileo," has assisted on Tokyo murder cases before. Soon, both the local police and the Tokyo authorities (with help from Yukawa) are delving into Tsukahara's past and the goings-on in Hari Cove to try and uncover the culprit. In this leisurely-paced third book in the Detective Galileo series, Higashino presents an interesting mystery, but at times I found it hard to keep all the characters straight.