Murder! by narwhal!

When the tyrannical family patriarch Sir Ignatious Gristle is murdered on his 90th birthday at his country estate, every one of his gathered family members is a suspect. Trapped by a snowstorm with no way to contact the police, it's up to his mettlesome granddaughter, Edna, and her trusted tortoise, Charles Darwin, to determine whodunnit! Full of head-scratching clues, page-turning twists and a lot people acting suspiciously this is the first in a funny, spoofy middle-grade murder mystery series from Alex T. Smith.