There is a limited amount of research in the area of missing persons, especially adults. The aim of this research is to expand on the understanding of missing people, by examining adults' behaviours while missing and determining if distinct behavioural themes exist. Based on previous literature it was hypothesised that three behavioural themes will be present; dysfunctional, escape, and unintentional. Thirty-six behaviours were coded from 362 missing person police reports and analysed using smallest space analysis (SSA). This produced a spatial representation of the behaviours, showing three distinct behavioural themes. Seventy percent of the adult missing person reports were classified under one dominant theme, 41% were 'unintentional', 18% were 'dysfunctional', and 11% were 'escape'. The relationship between a missing person's dominant behavioural theme and their assigned risk level and demographic characteristics were also analysed. A significant association was found between the age, occupational status, whether they had any mental health issues, and the risk level assigned to the missing person; and their dominant behavioural theme. The findings are the first step in the development of a standardised checklist for a missing person investigation. This has implications on how practitioners prioritise missing adults, and interventions to prevent individuals from going missing.

Responding to reports of missing persons represents one of the biggest demands on the resources of police organisations. In the UK, for example, it is estimated that over 300,000 missing persons incidents are recorded by the police each year which means that a person in the UK is recorded missing by the police approximately every two minutes. However, there is a complex web of behaviours that surround the phenomenon of missing persons which can make it difficult to establish whether someone's disappearance is 'intentional' or 'unintentional' or whether they might be at risk of harm from themselves or others. Drawing on a set of missing person case reconstructions and interviews with the officers involved with these cases, this paper provides insights into the different stages of the investigative process and some of the key influences which shape the trajectory of a missing person's investigation. In particular it highlights the complex interplay between actions which are 'ordered and conditioned' by a procedural discourse around how missing persons investigations should be conducted, and the narratives that officers construct about how they approach investigations which are often shaped by a mix of police craft , 'science' and 'reputational' issues.

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Missing persons incidents incur considerable societal costs but research has overwhelmingly concentrated on missing children. Understanding the phenomenon among adults is underdeveloped as a result. We conducted an evolutionary concept analysis of the 'missing person' in relation to adults. Evolutionary concept analysis provides a structured narrative review methodology which aims to clarify how poorly defined phenomena have been discussed in the professional/academic literature in order to promote conceptual clarity and provide building blocks for future theoretical development. A systematic literature search identified k = 73 relevant papers from which surrogate terms for, and antecedents, consequences, and attributes of the occurrence of adult missing persons were extracted and analysed. The core attributes of the adult missing person are (i) actual or perceived unexpected or unwanted absence accompanied by an absence of information and (ii) a potential adverse risk outcome as perceived by those left behind. The centrality of mental ill-health in actual adult missing persons cases is not reflected in theoretical development which largely comprises descriptive typologies of variable quality and questionable utility. There is a clear need to shift research emphasis towards clinical and psychological domains of inquiry in order to further advance the field of adult missing persons research.