The Patient (DS Cross series‪)‬

Introducing your new crime thriller fix: Bristol detective DS George Cross, champion of the outsider, the voiceless and the dispossessed.
DS George Cross can be rude, difficult, and awkward with people. But his unfailing logic and dogged pursuit of the truth means his conviction rate is the best on the force. An outsider himself, having been diagnosed with Autism spectrum disorder, DS Cross is especially drawn to cases concerning the voiceless and the dispossessed.
Now, Cross is untangling the truth about a young woman who died three days ago. With no fingerprints, no weapon and no witnesses, the Bristol Crime Unit are ready to close the case. The coroner rules suicide: the woman had a long history of drug abuse. But her mother is convinced it was murder: her daughter has been clean and sober for over two years.
DS Cross is determined to defy his bosses and re-open the case, even if it costs him his career. Soon he is mired in a labyrinth of potential suspects – but can he solve the case before his superiors shut it down for good?