Mr. Darcy

Mr. Fitzwilliam Darcy is the central male character in Jane Austen’s Pride and Prejudice.

He is a wealthy gentleman who has an income of £10,000 a year. He owns a large estate called Pemberley in Derbyshire, England. He is the eldest child and only son of the late George Darcy and the late Lady Anne Darcy. Lady Anne was a daughter of the previous Earl Fitzwilliam, which connects Darcy to the aristocratic Fitzwilliam family. Mr. Darcy is also the nephew of Lady Catherine de Bourgh, and the first cousin of Anne de Bourgh and Colonel Fitzwilliam. His wife and true love is Elizabeth, the female protagonist of Pride and Prejudice. Source

The reference to Mr. Darcy in APWNH suggests that if Mohammed is Darcy, then Maura is Elizabeth "Lizzy" Bennet, with whom he shares a tempestuous relationship. Here's a useful guide to the kind of guy Darcy is:

His manners drew the contempt of many in Meryton as they perceived him as proud, sanctimonious, and inconsiderate due to his status. He was shown to be cold and aloof, with such a temperament being misconstrued as sheer arrogance. The narrator described him as clever but also as "haughty, reserved, and fastidious," with manners that, "though well-bred, were not inviting." This was shown to be only natural reserve and a discomfort in company that made him uneasy and defensive. His lack of "inviting qualities" was also due his arrogant disposition towards the lower classes in the beginning of the novel. He told Elizabeth on their walk that he was brought up to do the right thing, but not taught to be humble. Due to his status and the fact that he spent much of his childhood as an only child, his parents never taught him to control his temper or his pride.

This proved true, as his distant manner and apparent contempt for those around him earned the disdain of Elizabeth and many others, particularly in light of the claims of the charming George Wickham—that he was wronged by Darcy, however, it was eventually revealed that these first impressions were erroneous: Darcy's seemingly arrogant character masked a sincerely generous and upright nature, and it was Darcy, in fact, who was wronged by Wickham, whose own character was revealed to be untrustworthy and duplicitous. SOURCE

So, Darcy seems to be a bit of a jerk throughout "P+P", but he has his reasons: still waters run deep, and he's trying to do the right thing. Thus, Mohammed is Mr Darcy in this context because he is inscrutable and difficult to read, but underneath it all, Anna is betting that he has love for Maura. Perhaps. This also gives us a hint into Maura and Mohammed's relationship: the will-they-or-won't-they dynamic, even though outwardly it might look unlikely.