#1
Introducing Gertrude, Gumshoe
R.E. Merrill
#2
Gertrude, Gumshoe: Murder at the Thrift Store
R.E. Merrill
#3
Gertrude, Gumshoe and the VardSale Villain
R.E. Merrill
#4
Gertrude, Gumshoe: Slam Is Murder
R.E. Merrill
#5
Gertrude, Gumshoe: Gunslinger City
R.E. Merrill
#6
Gertrude, Gumshoe and the Clearwater Curse
R.E. Merrill