The Ladies of the Vale — Andrew Puckett

It's not terribly unusual for patients in intensive care to die; after all they come in with the odds stacked heavily against them. But when seven patients who were on the road to recovery die unexpectedly in a mere six-week period nursing sister Jo Farewell begins to suspect that a serial killer might be responsible for their deaths in the Intensive Therapy Unit at Latchvale Hospital. Alone in her suspicions she is greeted with polite skepticism when she reports her misgivings to her boss and to the police.
And then another patient dies without warning. Feeling frustrated and helpless, Jo is on her own until the arrival of Tom Jones, an unconventional Home Office Investigator with plans for an undercover operation. He is convinced that the deaths are not random. But what is the link? Dogged investigation reveals a possible plot involving organ donors, and then Jo and Tom find an even more sinister connection - one that leads into a nightmare of religious fanaticism, cold-blooded manipulation, and murder.