Eesti keeles ei suuda selle raamatu sisu kohta infot leida - peategelane Jimmy Dale, kelle kohta Wikipedias selline kirjeldus:

A wealthy playboy by day, at night he puts on inconspicuous dark clothes, a mask and a black slouch hat and becomes The Gray Seal, who enters businesses or homes and cracks safes, always leaving a diamond shaped, gray paper "seal" (with gum on the back) behind to mark his conquest (so others will not be blamed for his crimes), but never taking anything. He was just doing it for "the sheer deviltry of it" at first, but when an unknown woman known only as Tocsin (from chapter 7, after he finds a ring belonging to her with "Sonnez le Tocsin" on it, French for "Ring the alarm bell") catches him (before the first book) she blackmails him to war on certain crime organizations.[1] In the first story, she had left him alone for a year with no new cases. She soon makes up for lost time.