While it's a little advanced, but not too terribly so, Reginald Garrigou Lagrange's "God: His Existence and Nature" is a really good exposition of the five ways, and the metaphysical principles behind them. The benefit for you would be that it was originally written in French, and as I recall you're a native French speaker, so I imagine it would be nice to have a work written in such. Lagrange's "Reality" is also good, and deals with a wide range of metaphysical questions.
Anything by Jacques Maritain is also great, and stands a good chance of being available somewhere for you in the original French.
Anthony Rizzi's "The Science Before Science" is a good work on the relationship between Thomistic metaphysics and modern science, and it's written by a philosophically well-informed Phd physicist, which is a nice plus.
Last edited by Timotheos (4/22/2016 1:57 pm)