1. A method of presenting surveillance data for an area, the method comprising: receiving sensor data and transaction data for a retail store on a computer system including at least one computing device, the transaction data including data on at least one point of sale (POS) event; associating at least some of the sensor data with each of the at least one POS events using the computer system; storing the transaction data and associated sensor data as surveillance data for the POS event using the computer system; providing primary surveillance data for a set of primary events corresponding to one of a plurality of monitored event types for display to a user in a user interface using the computer system, wherein each of the plurality of monitored event types corresponds to a human action occurring within the area; obtaining a selected event identified by the user using the user interface from the set of primary events and a corresponding set of relatedness criteria on the computer system in response to the providing, wherein the set of relatedness criteria defines a set of attributes of surveillance data indicating an event may be related to the selected event; identifying a set of related events corresponding to another one of the plurality of monitored event types based on the surveillance data for the selected event and the set of relatedness criteria using the computer system in response to the obtaining; and providing related surveillance data for each related event for display to the user in the user interface using the computer system in response to the identifying, wherein the user interface includes a first display area for displaying the primary surveillance data and a second display area distinct from the first display area for concurrently displaying the related surveillance data with the primary surveillance data, wherein the set of primary events include merchandise returns at the retail store and the set of related events include customer entrances to the retail store.