CONTENTS

CHAPTER PAGE

I. A Valuable Letter 11

II. A Mysterious Key 25

III. An Arrogant Guest 38

IV. A Face at the Window 51

V. The Lost Key 67

VI. Midnight Visitors 76

VII. “Ghost” Music 93

VIII. The Ivory Collection 102

IX. A Scrap of Paper 115

X. The Wall Safe 131

XI. A Night Adventure 140

XII. A Suspicious Act 150

XIII. The Secret Stairs 164

XIV. A Diamond Ring 175

XV. Penny’s Evidence 186

XVI. Mrs. Leeds’ Strategy 199

XVII. The Man in the Boat 209

XVIII. A Daring Theft 220

XIX. The Tables Turn 225

XX. A Break for Freedom 239

CHAPTER I
A Valuable Letter

“Hurry, Susan! We have only ten minutesbefore the store closes!”

Penelope Nichols, the slender girlin blue, urged her companion into the revolvingdoors at the entrance of the Bresham DepartmentStore. A vigorous push sent the barriersspinning at such a rate that other shoppersturned to stare at the two girls.

“You nearly took off my heels that time,Penny,” Susan Altman protested with a laugh asthey emerged into the crowded store.

“Sorry, but we’ve no time to waste if I get thatpair of white earrings. The clerks are startingto put things away already.”

Threading their way through the outgoingstream of

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