I reviewed Heartsick here.   I loved the first book so much that I bought the rest of the series.  Archie stays obsessed with Gretchen Lowell the serial killer who tortured him, and continues to visit her in prison, under the guise that she is giving him more victim’s bodies, so he has to go. The real reason is obsession. I love how flawed all of the characters are. I have always been intrigued by serial killers, maybe I shouldn’t admit that, but I loved the way the series really got you inside her head. All of the books are brilliant, and have you on the edge of your seat.