[CHAPTER X]
POLTON IS MYSTIFIED
[CHAPTER XI]
THE AMBUSH
[CHAPTER XII]
IT MIGHT HAVE BEEN
[CHAPTER XIII]
MURDER BY POST
[CHAPTER XIV]
A STARTLING DISCOVERY
[CHAPTER XV]
THE FINGER-PRINT EXPERTS
[CHAPTER XVI]
THORNDYKE PLAYS HIS CARD
[CHAPTER XVII]
AT LAST