The headhunters : an Inspector Hen Mallin investigation

"Gemma and Jo on a double date with Jake and Rick discuss forming a murder society and calling themselves "The Headhunters," but some of Rick's suggestions sound uncomfortably serious."
"Gemma and Jo on a double date with Jake and Rick discuss forming a murder society and calling themselves "The Headhunters," but some of Rick's suggestions sound uncomfortably serious."@en
"Jo and Gemma are friends who meet for coffee every Saturday to gossip and discuss the state of the world. At one such meeting, Gemma mentions killing her boss and Jo goes along with the joke. But Jo is not amused when she finds a real body on the beach at Selsey soon afterwards - an unidentified nearly-naked woman, who has been drowned. It takes DCI Hen Mallin and her team some time to discover who the woman is, and as they are investigating, Jo and Gemma are getting into more trouble - they keep coming across dead bodies..."
"Chichester CID inspector Henrietta "Hen" Mallin investigates a series of deaths by drowning that may be the work of an ex-con with a suspicious past."