A Cold Heart: An Alex Delaware Novel by Jonathan Kellerman
After the events of "The Murder Book", Robin and Alex have separated. Robin moved out and quickly fell in with a man named Tim, who was a vocal coach she met out tour. Meanwhile, Alex has started a serious relationship with a fellow psychologist, Allison Gwynn, who appeared in The Murder Book for the first time. While the two have broken their relationship, the two remain in contact during the course of the book, which suggest that some unresolved feelings still remain. At the same time, Alex Delaware is pulled into a case in which several "young, up-and-coming" artists are murdered, some of which Alex had met during his time with Robin. Towards the end of the novel Alex and Allison's relationship seems to be going strong, but there are some unresolved issues between Alex and Robin that have yet to play out.