Haley's mother disappeared while on a trip to Iceland, and a year later, when her father takes her there to find out what happened, Haley finds herself deeply involved in an ancient saga that began with her Nordic ancestors.

"A girl grows up visiting Snæfellsjökull, the glacier near her home, but when preteen life throws her off-center she must reconnect with her icy old friend"--

When one of the Thea Sisters' favorite mystery writers goes missing, the five mice travel to the author's native Iceland, where they reconstruct the dangerous plot of his latest novel in the icy terrain to piece together clues.

There is a legend that if the ravens at the Tower of London ever leave then Britain will fall, so when somebody steals the birds, the Queen calls for Mac B. to find the thief and retrieve them--a mission that takes him to Iceland, where he encounters secret submarines, hungry polar bears, and his arch-nemesis from the KGB.