The Man in the Brown Suit by Agatha Christie (Pan, 1959)

Found in a charity shop on a shelf full of Christie paperbacks:

THE mysterious man in the brown suit is a link between a fatal accident at a London Underground station and the body of a strangled woman found at a Member of Parliament's lonely country house.

Enterprising Anne Beddingfeld, back by a newspaper magnate, follows clues leading to South Africa, and there finds herself plunged into a highly dangerous Secret Service adventure.

First published early in Agatha Christie's career in 1924, this book was written while she was still experimenting with different genres.  It is a thriller rather than a classic whodunnit--and her heroine is an enterprising amateur caught in the middle of things rather than a professional detective.  Readers of Christie's Hercule Poirot and Miss Marple series will find this a rather different kind of read!

Rogue Roman by Lance Horner (Pan, 1970)

Found on a dusty shelf in the Green Shed:

 

Imperial Rome--centre of the world--throbbing with the white heat of violence, bloodshed and uninhibited sexuality...

Bought as an actor, kidnapped by pirates, sold as a gladiator, young Cleon's beauty and flagrant masculinity made every woman--harlots and Vestal Virgins alike--desire him.

And passion drives Cleon to help destroy a Caesar who combined the vices of his predecessors with his own special perversions--the Emperor Nero.

Soft-core sixties smut, with a plot revolving around a hero whose main attribute is... the size of his, um, main attribute:

Contux took a firmer grip on the cloth and yanked.  There was a ripping sound and the hand came away with the front of Cleon's tunic clutched in the swollen fingers...  "I take it back.  He's more than a man - he's a true stallion.  He was shouting the words and waving the cloth for all to see.

(Page 125) 

Why am I suddenly reminded of Biggus Dickus?

The Red Planet by Charles Chilton (Pan, 1960)

 

Blast off! to new heights of adventure and excitement

with JET MORGAN and the crewmen of the spaceship DISCOVERY, made famous in Charles Chilton's thrill-packed BBC radio series. 

In this book, Jet leads the first fleet of rocketships to reach across space from the Moon to the 'Red Planet', Mars.  But right from the beginning the expedition was ill-omened.  Uncanny happenings were to test their courage to breaking point, both on the long space flight and on the hostile planet itself.

Nerve-racking sequel to JOURNEY INTO SPACE

"Jet Morgan"!  Now there's a name that really belongs in a mid-century space opera.  And what better adventure for a mid-century space hero than to battle nefarious aliens on Mars?

Jet made his debut on BBC radio in 1953.  The Red Planet is a novelization of his second serial (also on radio) broadcast in 1954.   Both serials were immensely popular in their day--pulling a bigger audience in their timeslots than television.   They're available to download at Old Time Radio Download for anyone who's interested.

Fool the Toff by John Creasey (Hodder & Stoughton, 1954)

 

Was "Love's Matrimonial Agency" a racket shop?  Jane Abbott met her husband there and he vanished--her money with him.  The Toff went to see Miss Love and found a most remarkable woman.  Then there was Jeremiah Matt, an equally remarkable man.  In fact the Toff met many new acquaintances and one of them made a fool of him.  Others... died.

This blurb is taken from the half-title page, as the back cover is filled with an advertisement:

 

Every once in a while I stumble across one of these on a secondhand bookstall.

As for the Toff--as the title of this book says, he is indeed fooled!  In the end, all the mysteries contained therein are  solved by his "man", Jolly--which is not what you expect of a story with a crime-fighting gentleman hero!