Mystery and Crime Benson, Mildred: Penny Parker Omnibus.V1.June 22 2012

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From Wikipedia:

Penny Parker was the heroine of a series of 17
books written by Mildred Wirt and published
from 1939 through 1947. Penny was a high
school student who turned sleuth while
occasionally working as a reporter for her
father's newspaper.

The series (title and publication date):

1 Tale of the Witch Doll 1939
2 The Vanishing Houseboat 1939
3 Danger at the Drawbridge 1940
4 Behind the Green Door 1940
5 Clue of the Silken Ladder 1941
6 The Secret Pact 1941
7 The Clock Strikes Thirteen 1942
8 The Wishing Well 1942
9 Ghost Beyond the Gate 1943
10 Sabateurs on the River 1943
11 Hoofbeats on the Turnpike 1944
12 Voice from the Cave 1944
13 The Guilt of the Brass Thieves 1945
14 Signal in the Dark 1946
15 Whispering Walls 1946
16 Swamp Island 1947
17 The Cry at Midnight 1947