The city of Ludlow is gripped by the hottest July on record. The asphalt is melting, the birds are dying, petty crime is on the rise, and someone in Hannah Wagnor's peaceful suburban community is killing girls. For Hannah, the summer is a complicated one. Her best friend Lillian died six months ago, and Hannah just wants her life to go back to normal. But how can things be normal when Lillian's ghost is haunting her bedroom, pushing her to investigate the mysterious string of murders? Hannah's just trying to understand why her friend self-destructed, and where she fits now that Lillian isn't there to save her a place among the social elite. And she must stop thinking about Finny Boone, the big, enigmatic delinquent whose main hobbies seem to include petty larceny and surprising acts of kindness. With the entire city in a panic, Hannah soon finds herself drawn into a world of ghost girls and horrifying secrets. She realises that only byconfronting the Valentine Killer will she be able move on with her life - and it's up to her to put together the pieces before he strikes again.

Susan, with the help of her brothers, finds out who has sent her an anonymous valentine.

Special delivery! Louanne Pig is thrilled to find a beautiful valentine in her mailbox on February 14. But she’s dying to know whom it’s from. Is George her mysterious valentine? Is it Arnie or Harold or perhaps Big Mike? Louanne's only clue is that her secret admirer uses a green pen. Children and sweethearts everywhere will recognize the warm feelings that come with finding out someone likes you. Readers will chuckle as Louanne steals their hearts during her comical search to find out just who her secret admirer is.

In the sixth book of the Alien Next Door series, Harris explains Valentine's Day to Zeke, and Zeke develops a crush! Valentine's Day is right around the corner, and Harris explains the holiday and its traditions to Zeke. When Zeke gets an anonymous valentine, Harris is excited to help him figure out who sent it, but Zeke is confused at the customs of Earth, and his efforts to get a girl to notice him by doing what Harris tells him to don't go quite right. Will Zeke be able to turn things around and show his valentine his feelings?