Volume two of The Collected Novels of P. C. Wren, The Sinbad Novels, contains the four novels featuring the character of Sinclair Noel Brodie Dysart, whose nickname is Sinbad based on the initials of S.N.B.D. Part B contains Fort in the Jungle, the direct sequel to Sinbad the Soldier, and The Disappearance of General Jason, which is not a direct sequel to Fort in the Jungle and only features Sinbad as a minor, though important, character. At the end of Sinbad the Soldier, our hero, had been captured by French authorities and given the choice of prison or joining the French Foreign Legion. Instead of a North African desert Foreign Legion novel, Fort in the Jungle, has the setting of the Indo-China colonial wars of the late 1800s with the Black Flag Army. Sinbad is sent on a covert mission to a secret fort in the jungles of Vietnam. Here he has various adventures and meets the love of his life-the wife of the European advisor to the bandit army. The plot of The Disappearance of General Jason is concerned with the disappearance of a retired British army general. The story line and plot elements are quasi-science fiction in that there is a (sort of) lost race that the characters are involved with, aspects of uranium mining, and an H. G. Wells Island of Dr. Moreau element to it.