In Too Deep - Adam Croft

DS Wendy Knight has endured both tragedy and pain in her short time with Mildenheath CID's murder squad. Her grizzled partner DCI Jack Culverhouse has seen it all. But neither of them is prepared for a case without a single lead. 

A journalist with her finger on the pulse of Mildenheath’s corrupt underbelly is beaten within an inch of her life. With a comatose victim and a defenseless child as the only witness, Knight ' Culverhouse must reveal the horrifying truth before the ruthless killer comes back to finish the job.