Trick of the Dark - Val McDermid

When Charlie Flint is sent a mysterious package of cuttings about a brutal murder, it instantly grabs her attention. The murder occurred in the grounds of her old Oxford college - a groom 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, yet she can't get the crime out of her head. But as she delves deeper, and steps back into the mysterious world of Oxford colleges, she realises that there is much more to this crime than meets the eye...