CRITICAL CONDITION (4.5) by Sandra Orchard: Nurse and single mother Tara Peterson believes someone is killing her cancer patients. Detective Zach Davis is assigned to work undercover at the hospital. All the patients are part of Dr. Whittaker’s drug study, and some co-workers do not appreciate Tara’s insistence that the deaths are murders and not of natural causes. Zach must figure out if Dr. Whittaker is skewing the results of the study for financial gain — before Tara becomes the next victim. Well-developed characters and fast-paced action will keep readers fully engaged in this wonderful tribute to spouses struggling with a loved one’s illness.