Question: On which novel is the 1965 film with a character Agent Zeke Kelso based?

Related documents: [0]  [DOC] Dean Carroll Jones (January 25, 1931 – September 1, 2015) was an American actor best known for his roles as Agent Zeke Kelso in "That Darn Cat!" (1965), Jim Douglas in "The Love Bug" (1968), Albert Dooley in "The Million Dollar Duck" (1971; for which he received a Golden Globe nomination) and Dr. Herman Varnick in "Beethoven" (1992). [END] 
[1]  [DOC] That Darn Cat! is a 1965 American Walt Disney Productions thriller comedy film starring Hayley Mills (in her last of the six films she made for the Walt Disney Studios) and Dean Jones (starring in his first film for Disney) in a story about bank robbers, a kidnapping and a mischievous cat. The film was based on the 1963 novel "Undercover Cat" by Gordon and Mildred Gordon and was directed by Robert Stevenson. The title song was written by the Sherman Brothers and sung by Bobby Darin. The 1997 remake includes a cameo appearance by Dean Jones. [END]  
Answer: Undercover Cat
Undercover Cat