Jeffrey Deaver's Kathryn Dance books came to mind when I read your description of what she likes. Authors that she might not have discovered yet are John Hart who wraps a mystery in a great story and Josephine Tey's Alan Grant mysteries which are out of print classics you can find in the Canadian public domain.
ETA: I just saw Dan Brown in your list, Peter May's Enzo Macleod books are in the same vein, with puzzles to unravel.
Last edited by Synamon; 12-11-2012 at 06:38 PM.
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