Four studies in this issue explored various aspects of suicide. Analyses presented in Datapoints point to a "hidden epidemic of suicide" among younger women with military service—including veterans and active-duty personnel and members of the reserve and National Guard. Bentson H. McFarland, M.D., Ph.D., and coauthors urge clinicians to inquire about women's military service (page 1177). Prevention efforts in the United States have not reduced suicide incidence rates. Individuals seen in emergency settings after a suicide attempt are difficult to engage in treatment: up to 50% refuse outpatient care, and up to 60% drop out after one session. Is treatment engagement a neglected aspect in the care of these patients? The lead article is a literature review of 13 empirical studies of efforts to engage this population. Dana Lizardi, Ph.D., and Barbara Stanley, Ph.D., found that postdischarge follow-up by phone or letter or in person must be immediate, substantial, and multifaceted to be effective, even over the short term (page 1183). Lauren M. Denneson, Ph.D., and other Department of Veterans Affairs (VA) researchers in Oregon analyzed medical records of 112 veterans who completed suicide and who had at least one contact with VA health care in the year before death. Of those assessed for suicidal ideation at their final contact, 71% denied such thoughts (page 1192). Nestor D. Kapusta, M.D., and colleagues used Bayesian modeling techniques to examine whether the population density of mental health professionals had an impact on suicide rates in Austria. Regional socioeconomic conditions, which affected the distribution of these professionals, were stronger predictors of suicide rates than access to care per se (page 1198). In a Taking Issue commentary on these reports, Eric D. Caine, M.D., describes five major challenges in suicide prevention (page 1171).