Georges Simenon's "Mainly Maigret" is a vintage hardcover omnibus edition published in 1946 by Readers Union Limited. The book features three detective stories in one, following the adventures of Inspector Clouseau's roommate Maigret. 

Stories include: The Lodger (translated from the French Le Locataire by Stuart Gilbert, A Crime in Holland (translated from the French Un Crime en Hollande by Geoffrey Sainsbury), and The Sailor's Rendezvous (translated from the French Au Rendez-Vous des Terre-Nuevas by Margaret Ludwig). 

 This first edition omnibus is a must-have for fans of adventure and mystery genres, with 332 pages of gripping crime stories. The book is in French and has been well-preserved, with original yellow cloth binding, making it a great addition to any vintage book collection.