'A Killing Tree' series

A Killing Tree: Detective Inspector Zig Batten 1, by Paul Toolan
A January Killing: Detective Inspector Zig Batten 2 (A Killing Tree), by Paul Toolan
An Easter Killing (A Killing Tree Book 3), by Paul Toolan
The Killing of Queen Mab: Detective Inspector Zig Batten 4 (A Killing Tree), by Paul Toolan
A Secret Killing: Zig Batten 5 (A Killing Tree), by Paul Toolan
A Ring O'Bells Killing: Zig Batten 6 (A Killing Tree), by Paul Toolan