The White Monkey is the fourth of the nine novels in the Forsyte Chronicles and marks the opening of the second trilogy in the series, called A Modern Comedy. In this new chapter, Fleur and Michael Mont begin to question their marriage when their good friend, author Wilfred Desert, can no longer contain his passion for Fleur. Fleur finds herself torn between her love for Michael and passion for Wilfred.

Meanwhile, Soames Forsyte, as a director of the Providential Premium Reassurance Society, must root out the rumored indiscretions of a manager's dubious dealings with the Germans. The whole while, he is haunted by a painting of a white monkey with rinds of crushed fruit flung about it and eyes searching for something more.