The book of Luke is one of the most detailed books out of the four gospels. While Matthew is more authoritative, and John is more about love and conversion, Luke focuses on every bit of detail during Jesus' life on Earth, his death, and his resurrection.
Luke interviewed those that were eyewitnesses to Jesus' miracles and teachings. Going off of these testimonies, he used them to "compose a chronological account of the Savior's ministry." This is mentioned in Luke 1:1-4.
Jesus' birth story, that is told in Luke, is famously used in many churches around the Christmas season. This is because Luke is the only one of the four gospels that explains the story in great detail. Matthew only mentions that he was born, Matthew 1:18-25, but stops at that. Mark and John do not even mention the birth at all.
Luke's detailed work became so lengthy, that his book is also known for being the longest book in the New Testament. Many confuse it with the book of Matthew, because Matthew has more chapters than Luke. The book of Luke has more words and verses than Matthew, with the book of Acts coming in third place.
Luke has 1,151 verses, Matthew has 1,071 verses, and Acts has 1,006 verses. This information comes from http://catholic-resources.org/Bible/NT-Statistics-Greek.htm. Here, a study was done to conduct how many words and verses were in each book of the New Testament.
Kranz jokes in explaining the two books that are most similar to Luke, which is the book of Acts. In Acts, Luke again gives a detailed account of how life is now that Jesus has been resurrected.
Kranz's second book suggestion is again, the book of Acts. "Seriously, it's part two. Read Acts."