I heard this years ago on an A & E special about "Watergate". The show's contention was that John Dean set up the break in because his girlfriend's (Maureen, later his wife) name was in the books of that escort service. It had absolutley NOTHING to do with Nixon or his re-election. I've often wondered who convinced Nixon it DID have something to do with him and got the cover-up rolling.
I'll have to read this book.
No one told Nixon anything. Nixon assumed his good friend Att'y Gen'l John Mitchell was behind the breakin. Mitchell assumed it was Nixon. Neither one asked the other directly. Nixon had the incredible bad luck of assigning John Dean to find out who was behind the breakin. And Dean, being the culprit himself, used his position to prevent Nixon from learning the truth. This is in Silent Coup, which is definitely worth reading.