A female peregrine falcon at Parc Omega, Quebec.
I suspect you're right.. or a lanner.
Sakers and Lanners are quite hard to tell apart, they look really similar - sakers are a bit bigger and tend to be browner, lanners have a light cap and more defined facial streaks. But you get browner lanners and darker sakers so it's really difficult to call XD.
Looks like you have gone to the birds - and some pretty birds at that !