Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A fun book, a good read, makes you feel good

It's probably the kiss of death to say that a murder mystery is 'heartwarming', but that's what this one is. The book is by turns suspenseful, funny and touching, and gives one pause for thought. My Ride With Gus is a quick read, but one that will come back and tickle your memory when you aren't expecting it.