Death Has Deep Roots is the fifth novel by the British mystery writer Michael Gilbert. It was published in England by Hodder and Stoughton in 1951 and in the United States by Harper & Brothers in 1952. It is a classical courtroom trial story juxtaposed with thriller elements. Although Inspector Hazlerigg, who had appeared in all of Gilbert's earlier novels as a mostly leading character, does play a role in this story, it is only in two brief appearances, once towards the beginning of the book and once again near the end. Two of the three main characters in this book are from previous novels, Major Angus McMann (They Never Looked Inside) and Noel Anthony Pontarlier ("Nap") Rumbold (The Doors Open). The other leading character, the trial barrister Hargest Macrae, also appears in some of Gilbert's early short stories.
The novel is the basis of the 1956 Gibraltar Films production Guilty?, directed by Edmond T. Gréville and starring John Justin as Nap Rumbold.[1]