The new crime thriller book is about the crown jewels of London which had been stolen by an international cat burglar who turns out to be the cousin of Prince Harry.
a) which had been stolen by an international cat burglar who
b) that were stole by a famous international cat burglar who
c) which were stealed by a famous cat burglar that
d) that had been stolen by an international cat burglar which
e) who an international cat burglar had stolen and