Everybody has things they don’t want others to see. They’re either personal thinks or valuable items that should stay somewhere safe, where nobody can find them. Sometimes it’s best to hide something in plain sight. Secret drawers are perfect for that. They’re right there n front of you but you don’t suspect a thing.
Here’s an idea that’s both clever and practical. Use the space under the stair for storage. You can turn that space into a secret drawer and you can use it for storage for all sorts of items. Nobody would even suspect that something could be hidden there unless you make it visible by installing drawer handles.