She's a literary sleuth who stays with you long after the last page. A thirty-something London walking tour guide and literary researcher, Helen sometimes longs for a quiet life of reading, walking and writing. But she can’t resist a mystery, whether it’s a rumour of a hidden manuscript from the age of Shakespeare, or something troubling about her new students. Assisted by street-smart young journalist Nick Wilson and her elderly crossword-fiend neighbour Crispin Day, Helen seeks out clues from archives, cracks historical codes, unearths dangerous secrets and battles those who do not share her regard for the truth.

Here's the reading order:

Unlawful Things

The Peacock Room

The Crimson Thread

Folly Ditch