Hammer and Blood by Viktor Bloodstone
Mercenary assassin versus unstoppable, mask-wearing psycho!
Ptolemy Lindquist, one of the world’s greatest assassins, is contemplating retirement. Cali, his daughter, wants to have a fun vacation with her friends and boyfriend at a popular lake. Thanks to Ptolemy being hunted by other assassins and Cali investigating why the guys of the group are acting sketchy, father and daughter find themselves trapped in a house of horror by Zebadiah Seeley, a murderer and rapist who can’t be killed.