ooh maybe try the night circus by erin morgenstern? it's a really sweet romance in 1890's-ish america, its lightly fantasy but to be honest it's a really (and i mean REALLY) simple magic system- in fact its not even important for a lot of the book- so it might be a good taste-tester for the genre...
if not, then i'd recommend the sherlock holmes stories. they're all so addictive, iconic, and fun- see if you can work it out before holmes does!! maybe it will appeal to your bbc loving heart 😊