The Bet of the Monsters

After giving up every possession he has
in exchange for peace of mind and
getting away from everything that betrays him,
Leo finds himself in a weird situation.

He discovers a fortune falling onto his lap, in the
shape of a generous amount of money in his new
bank account and a leasehold of a prestigious house,
with only one explanation: Enjoy.

Should he play along?
What is the catch?