In science, a catalyst would be a substance that increases the rate of a chemical reaction; however, the definition when discussing language would be "someone or something spurring an event or action".
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If we are to make comparisons between the endings of <em>"The case of the missing masterpiece"</em> and<em> "The red-headed league"</em>, The Red-Headed League', is a mystery story that is about the famous detective Sherlock Holmes ends with the statement that a robbery will likely take place at night, because the tunnel is finished and the first book ends with a surprise as the mystery of the missing portrait has been revealed.
<h3>What is a Comparison?</h3>
This refers to the use of words in order to show the similarities and differences between two or more entities.
Hence, it can be seen that the similarity between the books is that there needs to be the crime solving by a detective or group of detectives.
Read more about comparisons here:
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Contrast is the right answer for the question
