I just stumbled onto two early tie-in novels at a yard sale:
"Walt Disney's ANNETTE and the Mystery at Smuggler's Cove."
"JANET LENNON at Camp Calamity"--an "Authorized TV Adventure" featuring the "Singing Star from the Lawrence Welk TV Show."
Who knew there were Lawrence Welk Show (!) tie-in novels? And an Annette Funicello mystery? Fascinating!