Bitcoin never got hacked due to high security, it's either your wallet or exchange got hacked due to your own fault or the poor services.

Consider to hire if you lose really huge amount since it wasting your time to track it yourself (even you know where's the Bitcoin belong to an exchange, they wouldn't give you their client information to unknown stranger asked in their email) and hire a lawyer will cost you a lot. Not to mention you could hire a fake lawyer.