Heartless

Still suffering after the tragic death of his wife, Private Investigator Derek Cole is hired to protect a family from their son who had already killed three and promised to add his family to his list of victims. Cole learns that their child was born without a heart and was listed as dead upon birth. Or so they were told.
Revenge is Only a Heartbeat Away

Alexander Black should not have lived. Born a con-joined twin, he shared one heart with his twin. When doctors, desperate to save at least one child, separated Alexander from the shared heart, they expected him to die.
But Alexander Black refused to die
Smuggled away and hidden in a psychiatric hospital where he is tested by doctors desperate to learn the medical mystery that is keeping him alive, Alexander grows. And as he grows, so too does his desire for revenge.