Books like Detection Unlimited
Georgette Heyer
Detection Unlimited is 343 pages, about 6 hours 17 minutes at 250 words a minute.
12 books to read next
How long each takes
Sweet Revenge 7.9 h 
Jamaica Inn 5.6 h 
In Pursuit of the Proper Sinner 13.2 h 
Kiss the Girls 8.5 h 
Jack & Jill 7.9 h 
Violets Are Blue 7.2 h 
Still Life 7.0 h 
Thunder on the Right 4.7 h 
The Kiss of the Devil 4.7 h 
The Housemaid 6.2 h 
Witches' Sabbath 3.5 h 
Lights Out 7.6 h Bar height shows length. Estimated at 250 words a minute.