The book "Intrusion Detection System in Wireless Sensor Network" provides a comprehensive analysis of the security challenges that arise in wireless networks, particularly in wireless sensor networks (WSN) and wireless ad-hoc networks. These networks consist of numerous low-cost sensors that communicate wirelessly with each other. Due to the nature of these networks, they are susceptible to various types of attacks, highlighting the need for an effective Intrusion Detection System (IDS). The book discusses different types of intrusions that can compromise network security and offers a detailed examination of various intrusion detection schemes, including their advantages and disadvantages. Additionally, quality parameters (QOS) of the network are analyzed to provide a better understanding of the performance of the proposed solutions.