  The paper deals with a mathematical model of a surveillance system based on a
net of sensors. The signals acquired by each node of the net are Markovian
process, have two different transition probabilities, which depends on the
presence or absence of an intruder nearby. The detection of the transition
probability change at one node should be confirmed by a detection of similar
change at some other sensors. Based on a simple game the model of a fusion
center is then constructed. The aggregate function defined on the net is the
background of the definition of a non-cooperative stopping game which is a
model of the multivariate disorder detection.
