[fw-auth] redirect after login from restricted page

I am working on a site that registered users can input comments which are
then emailed to other registered users - the email includes a link to the
comment - but users must be logged in to read the comment.

What I want is for the user to click the link (from the email) - if they are
not logged in they will go to a fail page that allows them to log in - when
they log in, they will be redirected to the page from the email link.

Can someone give me some direction on how I would do this redirection?
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