Slave — Katherine Anderson

After the incident at Westwood Asylum, Abby and Luke have laid low for a bit but it's summer, Luke's last summer before grad school, and the pair have one last exploration in them. Looking for a quiet place to shoot, the two head to an abandoned house in an old New England town on the Quabbin Reservoir, only to find out that their low key explore is anything but. Uncovering yet another decades old murder, Abby and Luke are again on the trail of a murderer but this time he's still alive, and he's not pleased about Abby's snooping.