Gertrude, Gumshoe Box Set: Books 4, 5, and 6

She's uncouth, uncooperative, and somehow—unstoppable. 

In books 4 through 6, Gertrude tears all over Maine trying to find crimes to solve. She adds another "assistant" to her team, competes in poetry slams, tries to fire a handgun, tracks down an ex-spook, and hunts down a ghost. 

Will Deputy Hale put an end to her unconventional (illegal) investigative methods? Will Calvin share his true feelings with someone? Will Gertrude figure out who the mysterious Dave really is?