Many traditional security systems could fail to detect breaches at all. For example, while a traditional burglar alarm would only detect movement, a microphone-equipped smart device could be capable of recognising the sound of shattering glass.
If or when it does recognise this sound, the smart device could respond by locking down some or all of the property and alerting you, the property owner. We could also diligently manage your Wi-Fi network to prevent it from failing just as your smart security tech would be called into action.
You could then decide, judging from the information provided to you by the smart security system, what steps you ought to take next.