Lent money to fund a deal, now can't get a call back

[Michael You]

Middle of last year, I lent money to fund a flip and close on a development deal. Both were meant to short term, 3-6 months until the flip sold, or until the development deal found a longer term investor. Now, after repeated attempts to contact the borrower by phone, text, or email to get any information, this person has gone radio silent. 

The flip deal is unsecured, the development deal is secured in 2nd position. 

What are my options to get money back? Any thoughts / ideas greatly appreciated.