Books like Clues in the shadows by Kathleen Ernst

A young woman must uncover the secrets of her family and loved ones to prevent the end of the world in an exciting fantasy story.

An Australian boy, Hart, and a Japanese-Australian girl, Mitsy, fall in love on the eve of World War II, only to be torn apart by the conflict that engulfs their homeland.

During the Nazi occupation of Amsterdam, 17‑year‑old Hanneke secretly trades black market goods while grieving her boyfriend’s death and shielding her parents from the harsh reality of wartime life.

Fifteen-year-old Wyn and his friend Gareth dream of a girl named Wyn and join forces with Wyn's great‑grandmother to solve a mystery that connects their pasts in wartime Wales.

Timeless — Kathleen Korbel He was the man from her dreams, the man who begged her, "Don't die." But now he was very real and lying half-conscious in Genevieve Mallory's old ocean-side house. He said his name was Rafe, and that he'd been sent to save her. But Genevieve wasn't sure if Rafe as a dream come true or a nightmare in disguise.... Devil and the Deep Blue Sea — Carla Cassidy Darlene Taylor arrived at the secluded inn on the Maine coast for a vacation, but something was wrong from the moment she checked in. Everyone she met seemed to watch her intently, knowingly ... including handsome Quintin Marshall. Darlene wanted to trust him, but she sensed evil closing in—and Quint could be part of it.... The Phantom of Chicago — Lori Herter Far below the Chicago streets, living in a dark, abandoned tunnel, the phantom of the night knew it was time to seek out the woman he loved and spirit her down to his world. Only then could he protect Crystal Winthrop from the dangers that lurked above—and only then would she be his....

A twenty‑two‑year‑old orphan named Haskell Maloney uncovers that the war hero she thought was her father was not, and races to learn her true identity while facing a deadly threat in Chicago’s Oriental Institute.

Old Ms. McMartin is definitely dead. Now her crumbling Victorian mansion lies vacant. When eleven-year-old Olive and her dippy mathematician parents move in, she knows there's something odd about the place--not least the walls covered in strange antique paintings. But when Olive finds a pair of old spectacles in a dusty drawer, she discovers the most peculiar thing yet: She can travel inside these paintings to a world that's strangely quiet . . . and eerily like her own. Yet Elsewhere harbors dark secrets--and Morton, an undersized boy with an outsize temper. As she and Morton form an uneasy alliance, Olive finds herself ensnared in a plan darker and more dangerous than she could have imagined, confronting a power that wants to be rid of her by any means necessary. It's up to Olive to save the house from the dark shadows, before the lights go out for good.

Eleven‑year‑old Olive and her parents move into a Victorian mansion, where mysterious paintings, a temperamental nine‑year‑old, and three talking cats reveal a dark plan that blurs magic, time and space.

A dual narrative that marries a modern teen’s visit to war‑torn Amsterdam with the wartime diary of 19‑year‑old Geertrui, whose accounts reveal the challenges of British soldiers attempting to liberate the Netherlands.

A complex plot intertwines with the intricate relationships between January 30, Sean Dillon, and the Angel of Death, leading to a thrilling investigation into the forces behind the violent and deadly January 30 alliance and their plan to spark another war in Ireland.