Trick of the dark - Val McDermid

Charlie Flint is sent a mysterious package of press cuttings about a brutal murder which occurred in the grounds of her old Oxford college.
A groom was battered to death just hours after his wedding.
As his bride and wedding guests sipped champagne, his alleged killers were slipping his bloodstained body into the river.
Charlie doesn't know who sent the package, or why, but with her professional life as a clinical psychiatrist in tatters, she has plenty of time on her hands to investigate.
But as she delves deeper and steps back into the closeted, mysterious world of Oxford colleges, she finds more to this crime than meets the eye.
And every step she takes towards the truth is a step closer to danger.