Righteous Prey by John Sandford
"Righteous Prey by John Sandford is book number 32 in Sandford's long-running 'Lucas Davenport' series. For those unfamiliar with this series, the main character, Lucas Davenport is a former Minneapolis Police Officer, now US Marshall. In Righteous Prey Lucas teams up again with another favorite Sandford series character, Virgil Flowers. Together they must track down 'The Five', a group of vigilante bitcoin billionaires who have decided to cleanse America of those they believe are society's worst. With Lucas and Virgil on any case, it's always a fast-paced adventure, mixed with the now familiar personalities of the main characters and those in their lives. For anyone new to this series, this is fine as a stand-alone novel as well."