Side Effects — Jeff Menapace

Now, following the death of her husband and son, she can barely get out of bed.                            

Desperate, Maggie agrees to take part in a drug trial--a last-ditch effort to find something that might help her cope.

The drug helps.

However, it also carries several side effects, not the least of them being an odd heightening of all her senses...just the kind of thing her old partner could use to help the FBI track down a ruthless killer who is proving impossible to catch.