The "I Believe in Christ Legacy" by Jane P. Merrill (Read the account from Sister McConkie by going to THIS link and a reference of the account mentioned is also found HERE)
I hope Elder McConkie's testimony blesses you as it has me. I am grateful that we continue to benefit from his powerful witness as we worship by singing the Hymn "I Believe in Christ."
Love and Blessings,
Go HERE for the text
Here are YouTube Videos