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The Weight of Evidence by Roger Ormerod
'Fred Wallach had been shut away in a bare shed. He had no means of escape. Yet by morning, he had disappeared. When the private detectives David Mallin and George Coe are hired to recover the missing builder, what initially appears as a harmless joke, played by Fred’s colleagues, turns out to be something far more elaborate than first thought. As they begin searching for clues to locate Wallach, Mallin and Coe quickly unveil some dark secrets about their victim. Wallach, a callous and devious man, was disliked by a wide range of people. With nothing about the disappearance making sense, the mystery of the vanishing man appears an impossible case to solve. When the missing person case becomes a murder investigation, Mallin and Coe find themselves under mounting pressure to deliver a resul.. '
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