Instruction: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
These books are not "great literature" (sorry Stephen Leather), but they are great fun.  However, they are well written, the characters interesting and the plotline compelling.  You will fall in love with the main character, Jack Nightingale.  I found myself wanting to know what would happen next in each subsequent book in the series.  The book is a bit bloody in parts, so if you are squeamish this might not be the novel for you.  The book and subject matter is dark but I do enjoy a twisty tale of murder and mayhem.  I have read the rest of the series and would recommend reading the books in order.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: A: very positive