A Peridale Cafe Mystery, book 3: Doughnuts and DeceptionAgatha Frost2017

Julia never expected to be caught up in another murder investigation, but when she discovers that homeless people are dying suspiciously and the police aren't investigating, she can't sit back and do nothing. After promising her young lodger, Jessie, that she will do everything she can to help, Julia finds herself diving headfirst into the case, aided by her new Detective Inspector boyfriend, Barker. Sure there is a serial killer preying on the vulnerable residents of an old burnout warehouse, Julia must act quickly to get to the bottom of the mystery, but can she crack the case before more bodies turn up?