Fifty Fifty by Candice Fox and James Patterson (2018) Little Brown & Company 

The second in the series about Australian Detective Harriet Blue.  She is banished, once again, from being able to visit her brother’s trial, and sent to a small town in the outback.  Harry helps the local law enforcement solve a grisly murder of the retired sheriff.  But she finds herself ‘partnered’ a Federal investigator who is convinced radicalized Muslims must be involved.  The ‘mayor’ wants the case solved quickly, because of its effect on town morale and possible tourist trade.  His daughter thinks its all bullshit.  The locals want to blame a local Muslim kid, just because he’s Muslim and rebellious.  They find a backpack on the side of the road with a diary that includes the plans to kill the sheriff.  Then the Muslim kid is killed in Harry’s vehicle.