THE PENNY PARKER SERIES
By MILDRED WIRT
...I *think* the order is correct.

1. TALE OF THE WITCH DOLL -- 1939. Cupples and Leon.
2. THE VANISHING HOUSEBOAT
3. DANGER AT THE DRAWBRIDGE -- 1940.. Cupples and Leon.
4. BEHIND THE GREEN DOOR -- 1940. Cupples and Leon.
5. THE CLUE OF THE SILKEN LADDER -- 1941. Cupples and Leon.
6. THE SECRET PACT -- 1941. Cupples and Leon.
7. THE CLOCK STRIKES THIRTEEN -- 1942. Cupples and Leon.
8. THE WISHING WELL -- 1942. Cupples and Leon.
9. SABOTEURS ON THE RIVER -- 1943. Cupples and Leon
10. GHOST BEYOND THE GATE -- 1943. Cupples and Leon. 
11. HOOFBEATS ON THE TURNPIKE -- 1944. Cupples and Leon.
12. THE VOICE FROM THE CAVE -- 1944. Cupples and Leon.
13. GUILT OF THE BRASS THIEVES -- 1945. Cupples and Leon.
14. SIGNAL IN THE DARK --  1946. Cupples & Leon.
15. THE WHISPERING WALLS -- 1946. Cupples and Leon.
16. SWAMP ISLAND -- 1947. Cupples and Leon.
17. THE CRY AT MIDNIGHT -- 1947.  Cupples and Leon.

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Source:

WorldCat Holdings