of how she was saved from that lake immersion. Perhaps
Paul is sane on all subjects except the murders. Even as to these he may
manifest much craft. Such crazed freaks sooner or later will lead to
sure exposure. Pierre knows his son's disordered mental state. It is
only necessary that both be well watched. Paul's irresponsible craze
will do the rest. The 'lay' of this spy can only be surmised. Perhaps
these villains are suspected of other crimes. It is improbable that any
self-constituted detective is on their trails. However, this sleuth will
be persistently shadowed. It is possible that thereby some important
'find' may occur. By such course our bureau will hedge against all
interference."

Sir Donald is greatly encouraged. That the agency fully believes in
murder of Oswald Langdon by Paul Lanier is immaterial. The death of
Alice Webster is only too certain. Paul thinks he has slain both. It is
not strange if thoughts of his awful crimes have caused at least partial
madness. Sir Donald says: "This homicidal mania may lead to queer
freaks. There are no reliable rules to follow in treatment of such a
man. It will be necessary to guard against every possible surprise. Paul
must be so carefully and constantly watched as to render his being at
large harmless. Otherwise, more deaths may be chargeable to his account."

The chief agrees, and replies:

"It will not do for you or your daughter to remain in London. Sight of
either of you might cause the Laniers to leave. Stay of these villains
in London will promote exposure of their crimes through Paul's mad
infatuation. It is possible Paul sometimes may appear in vicinity of
Northfield. There is no telling but that his disordered fancy may find
material in former lake memories."

Sir Donald sees the force of these suggestions. He will employ guards at
Northfield and along shores of the lake. Father and daughter go home
that afternoon. As if in reverie, he says:

"I feel renewed confidence in the London agency. There have been many
obstacles. The system employed was faultless. It is unreasonable to
judge by the results. Have not my own most subtle, well-matured plans
proved unavailing? You never thought of taking part in this scheming for
man-capture, yet every important link discovered should be credited to
your sweet infatuation. I hardly have treated this agency with proper
consideration.

"While kept posted by it, I have concealed much. Neither Paris hospital
confes