On Whom the Axe Falls. The Island Connection, #3

When he left his cottage to pick a few vegetables from his garden, Reverend Aloicius Quayle hadn't intended lying face down on the cold earth with the morning sun on the back of his head and a vine of runner beans crushed under his chest. He also hadn't intended to have a twenty centimetre bone handled brushed stainless steel knife stuck in his lower back. But sometimes life doesn't work out as planned, as Reverend Quayle discovered.
Before long more religious murders have Detective Inspector Angus Slooth and Detective Constable Sarah Flemons struggling to find the answers. How is the same gun involved in three unrelated murders over the course of seven years? And why are the murders linked by an old nursery rhyme? There's only one way to find out...