[Bonanza]

Originally Posted by villagetinker

Mr and Mrs Bike,

Not a clue, I would call the local police (non emergency number) and ask them, or possibly do a Google search on French Doors and security locks. Interesting question that you pose. All of my thoughts involve additional pieces of wood or metal that would be a pain to install and remove, and not very attractive. There must be a commercial product out there.
VT

The only thing that might be helppful besides the lock in the door's handle is to have a keyed deadbolt in addition to the lock in the handle (or knob).

These bad guys are a problem because if they really want to get in, they will simply break the glass.
A strikeplate on the outside is also helpful because it covers the locks.