Investigate Baby Monitor Hack

I need an expert to identify who hacked my baby monitor. The monitor is connected to a Wi-Fi network.

Requirements:
- Investigate and determine the source of the hack
- Secure the device and Wi-Fi network
- Provide a detailed report on findings

Ideal Skills:
- Experience with network security
- Knowledge of IoT device vulnerabilities
- Ability to secure compromised devices

Please share your experience and approach.